A reference guide to the Precision Workstation Diagnostic Indicators

A reference guide to the Precision Workstation Diagnostic Indicators



Dell Precision Workstation systems have a long history of built in diagnostic indicators. These can be audible beeps, power buttons that display different states and colours, specific diagnostics LEDs or a combination of them all, in order to indicate at which point during the Power On Self Test (POST) a system is having issues.

The following article is a reference guide to the codes available on each model and what those codes actually mean. These change through the various models and years. These indicators are merely a starting point to narrow down any troubleshooting you will carry out to identify the cause of your current issue. You can use this as a starting point to narrow down the proper troubleshooting guide you will need or you can contact technical support for further help and they will be looking for these indicators as well.


Table of Contents:

  1. Diagnostic LED's and Beep Codes for the Precision series (Prior to 2009)
  2. Diagnostic LED Codes for the Precision Series (2010 to 2011)
  3. Diagnostic LED Codes for the Precision series (2012 to 2013)
  4. Diagnostic LED Codes for the Precision series (2014 to 2017)
  5. Diagnostic LED Codes for the Precision series (2017 to Present)
  6. Diagnostic Indicator Guides

Note: For all the tables below, please remember that the diagnostic LEDs only serve as an indicator of the progress through the POST process. These LEDs do not indicate the problem that caused the POST routine to stop.


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Diagnostic LED's and Beep Codes for the Precision series (Prior to 2009)

Dell Precision systems have a long history of built in diagnostic indicators. These can be audible beeps and specific diagnostics LED's to indicate when during the Power On Self Test (POST) a system is having issues.

These models had a block of 1, 2, 3, 4, LED's on the front of the chassis that either lit up Green or were off. I've included a table below with what these indicated. These models were primarily Tower Systems.

380 Chassis View

LED Panel

LED Pattern
(1 2 3 4)
LED
Pattern
State
Name
State
Description
Suggested Resolution
Off Off System POST complete — LED time-out has occurred
  • If the LEDs came on and then went off, look at troubleshooting the display and the operating system.
  • If the LEDs never came on at any point then look into a power issue.
4 RCM BIOS checksum failure — Recovery mode
  • Reset the BIOS and clear the NVRAM
  • If this occurred after windows updates, check your startup wsn't corrupted.
3 CPU CPU configuration activity or failure; CPU Cache failure
  • Disconnect all external peripherals and configure PC down to PSU, Motherboard and CPU
  • If fault continues contact your technical support
  • If fault stops, plug disconnected parts back one at a time until fault re-occurs. Contact your technical support to take this further.
34 MEM Memory subsystem configuration activity or failure
  • Remove all memory from PC, does the LED code change?
  • If it doesn't contact your technical support
  • If it does add the memory modules back one at a time until the fault re-occurs, test that module in another slot and contact your technical support
2 PCI PCI device configuration or failure
  • Remove all external peripherals and all internal PCI devices
  • If fault continues contact your technical support
  • If fault stops, add parts back one at a time until fault re-occurs and contact your technical support
2 4 VID Video subsystem configuration or failure
  • Ensure the video cable is connected to the correct port
  • Reseat any add in graphics cards
  • If fault continues, remove any add in graphics cards and test with known good monitor and video cable
  • Contact your technical support once you know which part the fault follows
23 STO Storage device configuration or failure
  • Reseat the cables from the HDDs to the motherboard
  • If fault continues try substituting a known good HDD into the system and contact your technical support
234 USB USB subsystem configuration activity or failure
  • Remove all external peripherals and any internal CRUs
  • If LEDs change, add parts back one at a time until fault re-occurs and contact your technical support
  • If fault remains the same with parts removed, contact your technical support
1 No memory detected
  • Reseat all memory modules
  • If fault continues, try the memory in different slots and contact your technical support
1 4 MBF Fatal system board failure detected
  • Contact your technical support
1 3 Memory is detected, configuration or compatibility error
  • Reset the BIOS and clear the NVRAM and any previous errors
  • Remove all memory from PC, (This includes any Graphics cards.) does the LED code change?
  • If it doesn't contact your technical support
  • If it does add the parts back one at a time until the fault re-occurs, test that part in another slot and contact your technical support
1 34 PRV Indicates system activity preceding video initialization
  • Remove all external peripherals and any internal CRUs
  • If LEDs change, add parts back one at a time until fault re-occurs and contact your technical support
  • If fault remains the same with parts removed, contact your technical support
12 CFG System resource configuration
  • Reset the BIOS and clear the NVRAM and any previous errors
  • Remove all external peripherals
  • If LEDs change, add parts back one at a time until fault re-occurs and contact your technical support
  • If fault remains the same with parts removed, contact your technical support
12 4 Reserved
  • Reserved
123 POV POST complete — Onscreen error message
  • Troubleshoot as per the error message onscreen
1234 STD POST complete — OS hand-off complete
  • The Power On Self Test has passed all checks
  • Troubleshoot the HDD and the Operating System
Beep Code Description Suggested Resolution
1-1-2 CPU register test in progress Contact Technical Support
1-1-3 CMOS read/write test in progress or failure Run the Dell Diagnostics
1-1-4 BIOS ROM checksum in progress or failure Run the Dell Diagnostics
1-2-1 Timer Test in progress or failure Run the Dell Diagnostics
1-2-2 DMA initialization in progress or failure Run the Dell Diagnostics
1-2-3 DMA page register read/write test in progress or failure Run the Dell Diagnostics
1-3-1 RAM refresh verification in progress or failure Troubleshoot the memory and memory slots.
1-3-2 1st 64K RAM test in progress or failure Troubleshoot the memory and memory slots.
1-3-3 1st 64K RAM chip or data line failure (multi bit) Troubleshoot the memory and memory slots.
1-3-4 1st 64K RAM odd/even logic failure Troubleshoot the memory and memory slots.
1-4-1 1st 64K RAM address line failure Troubleshoot the memory and memory slots.
1-4-2 1st 64K RAM parity test in progress or failure Troubleshoot the memory and memory slots.
1-4-3 Fail-safe timer test in progress Troubleshoot the memory and memory slots.
1-4-4 Software NMI port test in progress Troubleshoot the memory and memory slots.
2-1-1 1st 64K RAM chip or data line failure - bit 0 Troubleshoot the memory and memory slots.
2-1-2 1st 64K RAM chip or data line failure - bit 1 Troubleshoot the memory and memory slots.
2-1-3 1st 64K RAM chip or data line failure - bit 2 Troubleshoot the memory and memory slots.
2-1-4 1st 64K RAM chip or data line failure - bit 3 Troubleshoot the memory and memory slots.
2-2-1 1st 64K RAM chip or data line failure - bit 4 Troubleshoot the memory and memory slots.
2-2-2 1st 64K RAM chip or data line failure - bit 5 Troubleshoot the memory and memory slots.
2-2-3 1st 64K RAM chip or data line failure - bit 6 Troubleshoot the memory and memory slots.
2-2-4 1st 64K RAM chip or data line failure - bit 7 Troubleshoot the memory and memory slots.
2-3-1 1st 64K RAM chip or data line failure - bit 8 Troubleshoot the memory and memory slots.
2-3-2 1st 64K RAM chip or data line failure - bit 9 Troubleshoot the memory and memory slots.
2-3-3 1st 64K RAM chip or data line failure - bit A Troubleshoot the memory and memory slots.
2-3-4 1st 64K RAM chip or data line failure - bit B Troubleshoot the memory and memory slots.
2-4-1 1st 64K RAM chip or data line failure - bit C Troubleshoot the memory and memory slots.
2-4-2 1st 64K RAM chip or data line failure - bit D Troubleshoot the memory and memory slots.
2-4-3 1st 64K RAM chip or data line failure - bit E Troubleshoot the memory and memory slots.
2-4-4 1st 64K RAM chip or data line failure - bit F Troubleshoot the memory and memory slots.
3-1-1 Slave DMA register test in progress or failure Run the Dell Diagnostics
3-1-2 Master DMA register test in progress or failure Run the Dell Diagnostics
3-1-3 Master IMR test in progress or failure Contact Technical Support
3-1-4 Slave IMR test in progress or failure Contact Technical Support
3-2-2 Interrupt vector loading in progress Contact Technical Support
3-2-4 Keyboard controller test in progress or failure Run the Dell Diagnostics
3-3-1 CMOS power fail and checksum test in progress Run the Dell Diagnostics
3-3-2 CMOS Config info validation in progress Run the Dell Diagnostics
3-3-3 RTC/Keyboard controller not found Run the Dell Diagnostics
3-3-4 Screen memory test in progress or failure Run the Dell Diagnostics
3-4-1 Screen initialization test in progress or failure Run the Dell Diagnostics
3-4-2 Screen retrace tests test in progress or failure Run the Dell Diagnostics
3-4-3 Search for video ROM in progress Run the Dell Diagnostics
4-2-1 Timer tick interrupt test in progress or failure Contact Technical Support
4-2-2 Shutdown test in progress or failure Contact Technical Support
4-2-3 Gate A20 failure Contact Technical Support
4-2-4 Unexpected interrupt in Protected Mode Contact Technical Support
4-3-1 RAM test in progress or failure above address 0FFFFh Run the Dell Diagnostics
4-3-2 No memory in Bank 0 Run the Dell Diagnostics
4-3-3 Interval Timer Channel 2 test in progress or failure Contact Technical Support
4-3-4 Time-Of-Day Clock test in progress or failure Contact Technical Support
4-4-1 Super I/O chip failure Run the Dell Diagnostics
4-4-4 Cache test failure Run the Dell Diagnostics


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Diagnostic LED's for the Precision series (2010 to 2011)

This series had a combination of Power button LED states with the diagnostic LEDs 1, 2, 3, 4. The diagnostics LED's are on the front of the chassis.

36105610/7610 Chassis

Note: There are 2 types of colour for the Power LED: Green or Blue depending on the system model.
Off Blinking Amber Solid Amber Solid Green Blinking Green
Off Blinking Amber Solid Amber Solid Green Blinking Green
Light Pattern Problem
Description
suggested Resolution
Diagnostic LEDs Power
Button LED
The computer is either turned off or not receiving power.
  • Reseat the power cable in the power connector on the back of the computer and the electrical outlet.
  • Bypass power strips, power extension cables, and other power protection devices to verify that the computer turns on properly.
  • Ensure that any power strips being used are plugged into an electrical outlet and are turned on.
  • Ensure that the electrical outlet is working by testing it with another device, such as a lamp.
  • Ensure that the main power cable and front panel cable are securely connected to the system board.
A possible system board failure has occurred.
  • Unplug the computer. Allow one minute for the power to drain. Plug the computer into a working electrical outlet and press the power button.

Blinking
A possible system board, power supply, or peripheral failure has occurred.
  • Power off computer, leaving the computer plugged in. Press and hold the power supply test button on the rear of the power supply unit. If the LED next to the switch illuminates, the problem may be with your system board.
  • If the LED next to the switch does not illuminate, disconnect all internal and external peripherals, and press and hold the power supply test button.If it illuminates, there could be a problem with a peripheral.
  • If the LED still does not illuminate, remove the PSU connections from the system board, then press and hold the power supply button. If it illuminates, there could be a problem with the system board.
  • If the LED still does not illuminate, the problem is probably with the power supply.
No CPU present.
  • Reinstall the CPU and restart the system. If the computer still fails to boot, inspect the CPU socket for damage.
Memory modules are detected, but a memory power failure has occurred.
  • If two or more memory modules are installed, remove the modules, then reinstall one module and restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error. If only one memory module is installed, try moving it to a different DIMM connector and restart the computer.
  • If available, install verified working memory of the same type into your computer.
A possible CPU or system board failure has occurred.
  • Replace the CPU with a known good CPU. If the computer still fails to boot, inspect the CPU socket for damage.
BIOS may be corrupt or missing.
  • The computer hardware is operating normally but the BIOS may be corrupt or missing.
A possible system board failure has occurred.
  • Remove all peripheral cards from the PCI and PCI-E slots and restart the computer. If the computer boots, add the peripheral cards back one by one until you find the bad one.
Power connector not installed properly.
  • Reseat the 2x2 power connector from the power supply unit.
Possible peripheral card or system board failure has occurred.
  • Remove all peripheral cards from the PCI and PCI-E slots and restart the computer. If the computer boots, add the peripheral cards back one by one until you find the bad one.
A possible system board failure has occurred.
  • Disconnect all internal and external peripherals, and restart the computer. If the computer boots, add the peripheral cards back one by one until you find the bad one.
  • If the problem persists, the system board is probably bad.
A possible coin cell battery failure has occurred.
  • Remove the coin cell battery for one minute, reinstall the battery, and restart.
The computer is in a normal on condition. The diagnostic lights are not lit after the computer successfully boots to the operating system.
  • Ensure that the display is connected and powered on.
A possible processor failure has occurred.
  • Reseat the processor.
Memory modules are detected, but a memory failure has occurred.
  • If two or more memory modules are installed, remove the modules (see your service manual), then reinstall one module (see your service manual and restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error.
  • If available, install working memory of the same type into your computer.
A possible graphics card failure has occurred.
  • Reseat any installed graphics cards.
  • If available, install a working graphics card into your computer.
A possible floppy drive or hard drive failure has occurred.
  • Reseat all power and data cables.
A possible USB failure has occurred.
  • Reinstall all USB devices and check all cable connections.
No memory modules are detected.
  • If two or more memory modules are installed, remove the modules (see your service manual), then reinstall one module (see your service manual) and restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error.
  • If available, install working memory of the same type into your computer.
Memory modules are detected, but a memory configuration or compatibility error has occurred.
  • Ensure that no special requirements for memory module/connector placement exist.
  • Ensure that the memory you are using is supported by your computer.
A possible expansion card failure has occurred.
  • Determine if a conflict exists by removing an expansion card (not a graphics card) and restarting the computer.
  • If the problem persists, reinstall the card you removed, then remove a different card and restart the computer.
  • Repeat this process for each expansion card installed. If the computer starts normally, troubleshoot the last card removed from the computer for resource conflicts.
A possible system board resource and/or hardware failure has occurred.
  • Clear CMOS.
  • Disconnect all internal and external peripherals, and restart the computer. If the computer boots, add the peripheral cards back one by one until you find the bad one.
  • If the problem persists, the system board / system board component is probably bad.
Another failure has occurred.
  • Ensure that all hard drive and optical drive cables are properly connected to the system board.
  • If there is an error message on the screen identifying a problem with a device (such as the floppy drive or hard drive), check the device to make sure it is functioning properly.
  • If the operating system is attempting to boot from a device (such as the floppy drive or optical drive), check system setup to ensure the boot sequence is correct for the devices installed on your computer.


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Diagnostic LED's for the Precision series (2012 to 2013)

With this series, the Diagnostic LED's changed to include a combination of the Power button LED state and the diagnostic LED indicators. The Diagnostic LED's remain 1, 2, 3, 4, and placed on the front of the unit. You could identify these system by their flat black and recessed Grill on the front face.

36105610/7610 Chassis

Note: There are 3 types of colour for the Power LED : Green, Blue or White depending on the system model.
Power Button LED State Description
Off Off Power is Off. LED is blank.
Blinking Amber Blinking Amber Initial State of LED at power up. Refer to the table below for Blinking Amber pattern diagnostic suggestions and possible failures.
Solid Amber Solid Amber The second state of the LED at power up, indicates that the POWER_GOOD signal is active and it is probable that the power supply is fine.
Blinking White Blinking White System is in a low power state, either S1 or S3. This does not indicate a fault condition.
Solid White Solid White System is in S0 state. This is the normal power states of a functioning machine. The BIOS will turn the LED to this states to indicate it has started fetching op-codes.

LED Panel

Note: Diagnostic LEDs can be either Green or Amber depending on the model type, but will always be either off, flashing or solid on.
State LED Pattern
( 1 2 3 4 )
LED Description Power LED State Assignment State Description
Pb0a Image of the LED pattern Off Off System Unplugged System is not plugged into AC, PSU is not plugged into system board, or control panel not connected to system board.
Pb0b Image of the LED pattern Off Solid White ACPI S0; Normal Operation System is on with no failures detected. This is actually a BIOS controlled state and is also S0e.
Pb0c Image of the LED pattern - all off Off Blinking White ACPI S1 Windows Standby State.
Pb1 Image of the LED pattern - All OFF Off Off ACPI S4 or S5 Hibernate or Soft off. System plugged in, but either turned off or in Windows Hibernation State.
Pb2 Image of the LED pattern - 3 On - 1, 2, 4 OFF 3 - Solid - Reserved Reserved
Pb3 Image of the LED pattern - 1,2 OFF - 3,4 ON 3,4 - Solid Blinking White ACPI S3 Suspend to RAM Windows Standby State.
Pb4 Image of the LED pattern - 1,3,4 OFF - 2 ON 2 - Solid - Reserved Reserved
Pb5 Image of the LED pattern - 1,3 OFF - 2,4 ON 2,4 - Solid - Reserved Reserved
Pb6 Image of the LED pattern - 1,4 OFF - 2,3 ON 2,3 - Solid - Reserved Reserved
Pb7 Image of the LED pattern - 1 OFF - 2,3,4 BLINKING 2,3,4 - Flashing On Solid Amber ACPI S0, hand off to BIOS control System on. BIOS not execution. This is the transition state to POST states.
Pb8 Image of the LED pattern - 1 ON - 2,3,4 OFF 1 - Solid - Reserved Reserved
Pb9 Image of the LED pattern - 1,4 BLINKING - 2,3 OFF 1,4 - Flashing On Solid Amber Non-System board Regulator Failure A power failure has been detected on a plug-in component such as VRM, Video Riser, or Memory Riser.
Pb10 Image of the LED pattern - 1,3 BLINKING - 2,4 OFF 1,3 - Flashing On Blinking Amber PSU Failure PSU may be bad or PSU cable may be crimped creating a short on a main power rail. (PS_ON asserted, PS_PWRGOOD not asserted)
Pb11 Image of the LED pattern - 1,3,4 BLINKING- 2 OFF 1,3,4 - Flashing On Solid Amber PSU Cable Failure All PSU cables may not be properly connected to system board. (PS_ON asserted, missing a main power rail)
Pb12 Image of the LED pattern - 1,2 BLINKING - 3,4 OFF 1,2 - Flashing On Solid Amber System board Regulator Failure A power failure has been detected in one of the onboard system board regulators. This could be caused by a failed system board component or by a plug-in device creating a short on a regulated power rail. (PS_ON asserted, PS_PWRGOOD asserted, SYS_PWRGOOD de-asserted)
Pb13 Image of the LED pattern - 1,2,4 BLINKING - 3 OFF 1,2,4 - Flashing On Off Mismatch Hardware detected a population incompatibility with a critical system component such as CPU, VRM, PSU, or MEMORY RISER.
Pb14 Image of the LED pattern - 1,2,3 ON - 4 OFF 1,2,3 - Solid - Reserved Reserved
Pb15 Image of the LED pattern - 1,2,3,4 ON 1,2,3,4 - Solid - Reserved Reserved
State LED pattern
( 1 2 3 4 )
LED Description State Name State assignment State description Suggested Resolution
S0a Image of the LED pattern - 1,2,3,4 OFF Off OFF OFF Power LED Off. No power is supplied to the system.
  • If the LEDs came on and then went off, look at troubleshooting the display and the operating system.
  • If the LEDs never came on at any point then look into a power issue.
S0e Image of the LED pattern - 1,2,3,4 OFF Off ON Normal Operation, ACPI S0 Power LED Solid Green/Blue or White. System has successfully booted and is operating normally.
S1 Image of the LED pattern - 1,2,3 OFF - 4 ON 4 RCM System is in Recovery Mode BIOS checksum failure was detected and the system is now in recovery mode.
  • Reset the BIOS and clear the NVRAM
  • If this occurred after windows updates, check your startup wsn't corrupted.
S2 Image of the LED pattern - 1,2,4 OFF - 3 ON 3 CPU CPU CPU configuration activity is in progress or a CPU failure was detected.
  • Disconnect all external peripherals and configure PC down to PSU, Motherboard and CPU
  • If fault continues contact your technical support
  • If fault stops, plug disconnected parts back one at a time until fault re-occurs. Contact your technical support to take this further.
S3 Image of the LED pattern - 1,2 OFF - 3,4 ON 3,4 MEM Memory Memory subsystem configuration activity is in progress. Appropriate memory modules were detected but a memory failure has occurred.
  • Remove all memory from PC, does the LED code change?
  • If it doesn't contact your technical support
  • If it does add the memory modules back one at a time until the fault re-occurs, test that module in another slot and contact your technical support
S4 Image of the LED pattern - 1,3,4 OFF - 2 ON 2 PCI PCI device PCI device configuration activity is in progress or PCI device failure was detected.
  • Remove all external peripherals and all internal PCI devices
  • If fault continues contact your technical support
  • If fault stops, add parts back one at a time until fault re-occurs and contact your technical support
S5 Image of the LED pattern - 1,3 OFF - 2,4 ON 2,4 VID Video Card Video subsystem configuration activity in progress or video subsystem failure.
  • Ensure the video cable is connected to the correct port
  • Reseat any add in graphics cards
  • If fault continues, remove any add in graphics cards and test with known good monitor and video cable
  • Contact your technical support once you know which part the fault follows
S6 Image of the LED pattern - 1,4 OFF - 2,3 ON 2,3 STO Storage Storage device configuration in progress or storage subsystem failure.
  • Reseat the cables from the HDDs to the motherboard
  • If fault continues try substituting a known good HDD into the system and contact your technical support
S7 Image of the LED pattern - 1 OFF - 2,3,4 ON 2,3,4 USB USB USB subsystem configuration activity in progress or USB subsystem failure.
  • Remove all external peripherals and any internal CRUs
  • If LEDs change, add parts back one at a time until fault re-occurs and contact your technical support
  • If fault remains the same with parts removed, contact your technical support
S8 Image of the LED pattern - 1 ON - 2,3,4 OFF 1 MEM Memory Memory subsystem configuration activity is in progress. No memory modules were detected.
  • Reseat all memory modules
  • If fault continues, try the memory in different slots and contact your technical support
S9 Image of the LED pattern - 1,4 ON - 2,3 OFF 1,4 MBF System board Fatal system board failure detected.
  • Contact your technical support
S10 Image of the LED pattern - 1,3 ON - 2,4 OFF 1,3 MEM Memory Memory subsystem configuration activity is in progress. Memory modules have been detected but appear to be incompatible or in an invalid configuration.
  • Reset the BIOS and clear the NVRAM and any previous errors
  • Remove all memory from PC, (This includes any Graphics cards.) does the LED code change?
  • If it doesn't contact your technical support
  • If it does add the parts back one at a time until the fault re-occurs, test that part in another slot and contact your technical support
S11 Image of the LED pattern - 1,3,4 ON - 2 OFF 1,3,4 PRV Other pre-video activity Indicates routine system activity preceding video initialization.
  • Remove all external peripherals and any internal CRUs
  • If LEDs change, add parts back one at a time until fault re-occurs and contact your technical support
  • If fault remains the same with parts removed, contact your technical support
S12 Image of the LED pattern - 1,2 ON - 3,4 OFF 1,2 CFG Resource configuration System resource configuration in progress.
  • Reset the BIOS and clear the NVRAM and any previous errors
  • Remove all external peripherals
  • If LEDs change, add parts back one at a time until fault re-occurs and contact your technical support
  • If fault remains the same with parts removed, contact your technical support
S13 Image of the LED pattern - 1,2,4 ON - 3 OFF 1,2,4 Reserved Reserved for future use. This pattern is being considered to indicate the Visual Off state on the Dimension systems.
  • Reserved
S14 Image of the LED pattern - 1,2,3 ON - 4 OFF 1,2,3 POV Other post-video activity Indicates routine system activity subsequent to video initialization.
  • Troubleshoot as per the error message onscreen
S15 Image of the LED pattern - 1,2,3,4 ON 1,2,3,4 STD Boot hand off Indicates End of POST process. LEDs are normally in this state briefly as POST completes. Once the hand-off to the OS is done, the LEDs turn off and transition to S0e state.
  • The Power On Self Test has passed all checks
  • Troubleshoot the HDD and the Operating System


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Diagnostic LED's and Beep Codes for the Precision series (2014 to 2017)

With this series, the diagnostics indicator LED's have been removed. Instead the Power Button state now gives a blink and colour shift pattern to indicate where its had a problem. You can identify these systems by the fact that there is no Diagnostics LED block on the front of the unit.

5810/7810/7910 Chassis

Power Button LED State Description
Off Off Power is Off. LED is blank.
Blinking Amber Blinking Amber Initial State of LED at power up. Refer to the table below for Blinking Amber pattern diagnostic suggestions and possible failures.
Solid Amber Solid Amber The second state of the LED at power up, indicates that the POWER_GOOD signal is active and it is probable that the power supply is fine.
Blinking White Blinking White System is in a low power state, either S1 or S3. This does not indicate a fault condition.
Solid White Solid White System is in S0 state. This is the normal power states of a functioning machine. The BIOS will turn the LED to this states to indicate it has started fetching op-codes.
State State Name Power Light:
Amber Blinking
Amber Blinking Pattern Problem Description Suggested Resolution
- - 2, 1 2 blinks followed by a short pause, 1 blink, long pause, then repeats Bad Motherboard
  • Contact Tech Support to troubleshoot the motherboard
- - 2, 2 2 blinks followed by a short pause, 2 blinks, long pause, then repeats Bad Motherboard, Power Supply or Power Supply cabling
  • If you can assist to troubleshoot, narrow down the issue with PSU BIST Test, reseat cable.
  • If nothing works, contact Tech Support
- - 2, 3 2 blinks followed by a short pause, 3 blinks, long pause, then repeats Bad Motherboard, Memory or Processor
  • If you can assist to troubleshoot, narrow down the issue by reseating memory and swapping a known good memory if available.
  • If nothing works, contact Tech Support
- - 2, 4 2 blinks followed by a short pause, 4 blinks, long pause, then repeats Bad coin cell battery
  • If you can assist to troubleshoot, narrow down the issue by swapping a known good coin cell battery if available.
  • If nothing works, contact Tech Support
S1 RCM 2, 5 2 blinks followed by a short pause, 5 blinks, long pause, then repeats BIOS Checksum Failure
  • System is in Recovery Mode.
  • Flash latest BIOS version. If problem persists, contact Tech Support
S2 CPU 2, 6 2 blinks followed by a short pause, 6 blinks, long pause, then repeats Bad Processor
  • CPU configuration activity is in progress or a CPU failure was detected.
  • Contact Tech Support
S3 MEM 2, 7 2 blinks followed by a short pause, 7 blinks, long pause, then repeats Memory failures
  • Memory subsystem configuration activity is in progress. Appropriate memory modules were detected but a memory failure has occurred.
  • If you can assist to troubleshoot, narrow down the issue with reseating memory and swapping a known good memory if available.
  • If nothing works, contact Tech Support.
S4 PCI 3, 1 3 blinks followed by a short pause, 1 blink, long pause, then repeats PCI Device or Video subsystem failures
  • PCI device configuration activity is in progress or PCI device failure was detected.
  • If you can assist to troubleshoot, narrow down the issue by reseating PCI card and removing one by one to determine which card failed.
  • Contact Tech Support.
S5 VID 3, 2 3 blinks followed by a short pause, 2 blinks, long pause, then repeats Video Subsystem failure
  • Video subsystem configuration activity in progress or video subsystem failure.
  • If customer can assist to troubleshoot, narrow down the issue by removing one by one to determine which card failed.
  • Contact Tech Support.
S6 STO 3, 3 3 blinks followed by a short pause, 3 blinks, long pause, then repeats No Memory detected
  • If customer can assist to troubleshoot, narrow down the issue by removing one by one memory to determine which one failed and swapping to a known good memory if available to confirm.
  • Contact Tech Support.
S7 USB 3, 4 3 blinks followed by a short pause, 4 blinks, long pause, then repeats Storage Subsystem failure
  • Possible storage device configuration in progress or storage subsystem failure.
  • If you can assist to troubleshoot, narrow down the issue by removing one by one the storages on motherboard to determine which one failed.
  • Contact Tech Support.
S8 MEM 3, 5 3 blinks followed by a short pause, 5 blinks, long pause, then repeats Memory configuration or incompatible error
  • Memory subsystem configuration activity is in progress. No memory modules were detected.
  • If customer can assist to troubleshoot, narrow down the issue by removing one by one the memory on motherboard to determine which one failed. Also, combining the configuration to validate appropriate combination.
  • Contact Tech Support
S9 MBF 3, 6 3 blinks followed by a short pause, 6 blinks, long pause, then repeats System board failure
  • Fatal system board failure detected.
  • If customer can assist to troubleshoot, narrow down the issue by removing one by one the component on motherboard to determine which one failed.
  • If you identified any of the components failed, replace the component.
  • Contact Tech Support
S10 MEM 3, 7 3 blinks followed by a short pause, 7 blinks, long pause, then repeats Possible memory failure
  • Memory subsystem configuration activity is in progress. Memory modules have been detected but appear to be incompatible or in an invalid configuration.
  • If customer can assist to troubleshoot, narrow down the issue by removing one by one the memory on motherboard to determine which one failed.
  • Contact Tech Support.


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Diagnostic LED's and Beep Codes for the Precision series (2017 to Present)

With the latest series the Power Button state now gives a new blink and colour shift pattern that uses both Amber and White power LED flashes to indicate where its had a problem. You can identify these systems by the fact that there is no Diagnostics LED block on the front of the unit.

5820/7820/7920 Chassis

Power Button LED State Description
Off Off Power is Off. LED is blank.
Blinking Amber Blinking Amber Initial State of LED at power up. Refer to the table below for Blinking Amber pattern diagnostic suggestions and possible failures.
Solid Amber Solid Amber The second state of the LED at power up, indicates that the POWER_GOOD signal is active and it is probable that the power supply is fine.
Blinking White Blinking White System is in a low power state, either S1 or S3. This does not indicate a fault condition.
Solid White Solid White System is in S0 state. This is the normal power states of a functioning machine. The BIOS will turn the LED to this states to indicate it has started fetching op-codes.
State State Name Power Light:
Amber Blinking
Amber Blinking Pattern Problem Description Suggested Resolution
- - 1, 1 1 amber blink followed by a short pause, 1 white blink, long pause, then repeats Bad Motherboard
  • Contact Tech Support to troubleshoot the motherboard
- - 1, 2 1 amber blink followed by a short pause, 2 white blinks, long pause, then repeats Bad Motherboard, Power Supply or Power Supply cabling
  • If you can assist to troubleshoot, narrow down the issue with PSU BIST Test, reseat cable.
  • If nothing works, contact Tech Support
- - 1, 3 1 amber blink followed by a short pause, 3 white blinks, long pause, then repeats Bad Motherboard, Memory or Processor
  • If you can assist to troubleshoot, narrow down the issue by reseating memory and swapping a known good memory if available.
  • If nothing works, contact Tech Support
S2 CPU 2, 1 2 amber blinks followed by a short pause, 1 white blinks, long pause, then repeats Bad Processor
  • CPU configuration activity is in progress or a CPU failure was detected.
  • Contact Tech Support
S1 RCM 2, 2 2 amber blinks followed by a short pause, 2 white blinks, long pause, then repeats BIOS ROM Failure
  • System is in Recovery Mode.
  • Flash latest BIOS version. If problem persists, contact Tech Support
S6 STO 2, 3 2 amber blinks followed by a short pause, 3 white blinks, long pause, then repeats No Memory detected
  • If customer can assist to troubleshoot, narrow down the issue by removing one by one memory to determine which one failed and swapping to a known good memory if available to confirm.
  • Contact Tech Support.
S3 MEM 2, 4 2 amber blinks followed by a short pause, 4 white blinks, long pause, then repeats Memory failures
  • Memory subsystem configuration activity is in progress. Appropriate memory modules were detected but a memory failure has occurred.
  • If you can assist to troubleshoot, narrow down the issue with reseating memory and swapping a known good memory if available.
  • If nothing works, contact Tech Support.
S8 MEM 2, 5 2 amber blinks followed by a short pause, 5 white blink, long pause, then repeats Invalid memory installed
  • Memory subsystem configuration activity is in progress. Appropriate memory modules were detected but appear to be incompatable or in an invalid configuration.
  • If you can assist to troubleshoot, narrow down the issue with reseating memory and swapping a known good memory if available.
  • If nothing works, contact Tech Support.
S9 MBF 2, 6 2 amber blinks followed by a short pause, 6 white blinks, long pause, then repeats Motherboard: Chipset
  • System board failure detected.
  • If customer can assist to troubleshoot, narrow down the issue by removing components one by one to determine which component failed.
  • Contact Tech Support.
S4 PCI 3, 2 3 amber blinks followed by a short pause, 2 white blinks, long pause, then repeats PCI Device or Video
  • PCI device configuration activity is in progress or PCI device failure was detected.
  • If you can assist to troubleshoot, narrow down the issue by reseating PCI card and removing one by one to determine which card failed.
  • Contact Tech Support.
- - 3, 3 3 amber blinks followed by a short pause, 3 white blinks, long pause, then repeats BIOS Recovery 1
  • System is in recovery mode
  • Flash with latest BIOS revision and Contact Tech Support if still not resolved
- - 3, 4 3 amber blinks followed by a short pause, 4 white blinks, long pause, then repeats BIOS Recovery 2
  • System is in recovery mode
  • Flash with latest BIOS revision and Contact Tech Support if still not resolved
- - 4, 6 4 amber blinks followed by a short pause, 6 white blinks, long pause, then repeats RAID Volume degraded
  • RAID volume is degraded.
  • If possible, boot to the F12 menu to enter the device configuration tab and rebuild the RAID volume.
  • Contact Tech Support if issue persists.
- - 4, 7 4 amber blinks followed by a short pause, 7 white blinks, long pause, then repeats System Side cover is missing
  • System side cover (either left or right) is missing.
  • Install the side covers and restart.
  • Contact Tech Support if not resolved.


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Diagnostic Indicator Guides


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Article ID: SLN295099

Last Date Modified: 08/24/2018 07:52 AM


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