OptiPlex 5040 - Mini Tower Owner's Manual

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Diagnostic and Power LED codes

Table 1. Power LED states . The following table describes possible power LED states , causes and troubleshooting steps :
Power LED light status	Possible cause	Troubleshooting steps
Off	The computer is either turned off or is not receiving power or in Hibernation mode.	Re-seat the power cable in the power connector on the back of the computer and the electrical outlet. If the computer is plugged into a power strip, ensure that the power strip is plugged into an electrical outlet and is turned on. Also, bypass power protection devices, power strips, and power extension cables to verify that the computer turns on properly. Ensure the electrical outlet is working by testing it with another device, such as a lamp.
Steady/blinking amber	Computer fails to complete POST or processor failure.	Remove and reinstall any cards. Remove and reinstall the graphics card, if applicable. Ensure the power cable is connected to the system board and processor.
Slow Blinking white light	Computer is in sleep mode.	Press the power button to bring the computer out of the sleep mode. Ensure all power cables are securely connected to the system board. Ensure the main power cable and front panel cable are connected to the system board.
Steady white	The computer is fully functional and in the On state.	If the computer is not responding, do the following: Ensure the display is connected and turned on. If the display is connected and turned on, listen for a beep code.

NOTE: Amber LED blinking pattern : The pattern is 2 or 3 blinks followed by a short pause then X number of blinks up to 7. The repeated pattern has a long pause inserted in the middle. Example 2,3 = 2 amber blinks, short pause, 3 amber blinks followed by long pause then repeats.

Table 2. Diagnostic power LED codes . The following table depicts the amber blinking patterns with possible troubleshooting and suggested resolution
State	State Name	Blinking Amber Pattern	Problem Description	Suggested Resolution
-	-	2 blinks > short pause > 1 blink > long pause > repeats	Bad Motherboard	Replace the motherboard
-	-	2 blinks > short pause > 2 blinks > long pause > repeats	Bad Motherboard, Power Supply or Power Supply cabling	If customer can assist to troubleshoot, narrow down the issue with PSU BIST Test, reseat cable. If nothing works, replace the motherboard, power supply or cabling
-	-	2 blinks > short pause > 3 blinks > long pause > repeats	Bad Motherboard, Memory or Processor	If customer can assist to troubleshoot, narrow down the issue by reseating memory and swapping an available known good memory. If nothing works, replace the motherboard, memory or processor
-	-	2 blinks > short pause > 4 blinks > long pause > repeats	Bad coin cell battery	If customer can assist to troubleshoot, narrow down the issue by swapping a known good coin cell battery if available. If nothing works, replace the coin cell battery
S1	RCM	2 blinks > short pause > 5 blinks > long pause > repeats	BIOS Checksum Failure	System is in Recovery Mode. Flash latest BIOS version. If problem persists, replace the motherboard
S2	CPU	2 blinks > short pause > 6 blinks > long pause > repeats	Bad Processor	CPU configuration activity is in progress or a CPU failure was detected. Replace the processor
S3	MEM	2 blinks > short pause > 7 blinks > long pause > repeats	Memory failures	Memory subsystem configuration activity is in progress. Appropriate memory modules were detected but a memory failure has occurred. If customer can assist to troubleshoot, narrow down the issue with reseating memory and swapping a known good memory if available. If nothing works, replace the memory.
S4	PCI	3 blinks > short pause > 1 blinks > long pause > repeats	PCIe Device or Video subsystem failures	PCIe device configuration activity is in progress or PCIe device failure was detected. If customer can assist to troubleshoot, narrow down the issue by reseating PCIe card and removing one by one to determine which card failed. If identified the PCIe card failed, replace the PCIe Card. If none of the PCIe Cards failed, replace the motherboard.
S5	VID	3 blinks > short pause > 2 blinks > long pause > 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. If identified the card failed, replace the card. If none of the card failed, replace the motherboard.
S6	STO	3 blinks > short pause > 3 blinks > long pause > 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. If identified the memory failed, replace the memory. If none of the memory failed, replace the motherboard.
S7	USB	3 blinks > short pause > 4 blinks > long pause > repeats	Storage Subsystem failure	Possible storage device configuration in progress or storage subsystem failure. If customer can assist to troubleshoot, narrow down the issue by removing one by one storages on motherboard to determine which one failed. If identified the storage failed, replace the storage. If identified the storage failed, replace the storage.
S8	MEM	3 blinks > short pause > 5 blinks > long pause > 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. If identified the component failed, replace the component. If none of the component failed, replace the motherboard.
S9	MBF	3 blinks > short pause > 6 blinks > long pause > 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 identified any of the component failed, replace the component. If none of the component failed, replace the motherboard.
S10	MEM	3 blinks > short pause > 7 blinks > long pause > 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. If identified the memory failed, replace the memory. If else, replace the motherboard.

WARNING: The power LED 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