Knowledge Base

No POST, No Power, No Video on a Dell Vostro Desktop Computer.


Table of Contents:

  1. Definitions
  2. No Post issues
  3. No Power issues
  4. No Video issues
  5. Beep Codes & Error Messages
  6. Dell Diagnostics

This article contains information regarding No POST, No Power, No Video issues on a Dell Vostro Desktop Computer


1. Definitions

We can define the 3 states of No Post, No Power & No Video as follows:

  • No Post (Power On Self Test) - Once the Power button is pressed, the system will go through a series of internal checks. If any of these checks should fail, the system will not boot to Windows and the diagnostic LED's and or Power button LED should illuminate to indicate the potential problem.
  • No Power - Once the Power button is pressed, no Diagnostics LED's will illuminate nor the Power button LED, the system will not boot to Windows and there will be no signs of power to the system, keyboard or mouse.
  • No Video - Once the Power button is pressed, the system will power on and proceed to the POST checks where you may see the Diagnostic LED's illuminate for a short period of time, the Power button LED will illuminate as well as the keyboard LED's but there will be no signs of video on the Screen/Display. You may hear the Windows login melody but the screen is blank.

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2. No Post issues

Power Button Status Possible Cause Troubleshooting Steps
Off The computer is either turned off or is not receiving power.
  • Turn on system.
  • Reseat 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 the power strip is plugged into an electrical outlet and is turned on.
  • Please refer to the No Power section for further trouble shooting steps.
Blinking Amber System fails to complete POST.
Processor failure
  • Remove and then reinstall any cards.
  • Remove and then reinstall the graphics card, if applicable.
  • Ensure the 4Pin ATX Power Connector is connected to motherboard.
  • Reseat the 4Pin ATX Power Connector for the Processor.
  • Reseat the Processor.
  • If available, swap in a verified working Processor of the same type.
  • If system still fails to POST with the same status, the Motherboard is possibly at fault.
Blinking Frequency: 0.5 Seconds ON, 0.5 Seconds OFF
NOTE:
When the CPU is not seated properly or not detected, the system will automatically power off.
Steady Amber System is in standby.

or

This is a system fault error condition, including the power supply. Only the +5VSB rail on the power supply is working correctly.
  • Press the power button to bring the system out of standby mode.
  • Ensure all power cables are securely connected to the system board.
  • Ensure the main power cable and front panel cable are securely connected to the system board.
NOTE:
If the system was abnormally turned off, you need to disconnect and plug in the AC power cord. Then turn on the system. Otherwise, you may see an incorrect power light state.
Blinking White System is in power saving state - Sleep or Stand By mode.
No fault/error condition
  • Press a key on the keyboard, move the mouse, or press the power button to resume normal operation.
Steady White The system 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.
  • Please refer to the No Video section for further troubleshooting steps.

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3. No Power issues

Power Button Status Possible Cause Troubleshooting Steps
Off The computer is either turned off or is not receiving power.
  • Reseat 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 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 the computer turns on properly.
  • Ensure the electrical outlet is working by testing it with another device.
  • Use a verified working Power cable.
  • Ensure that the main power cable and front panel cable are securely connected to the system board.
  • All power supply units include a self-test ability in an isolation mode. A test button and LED are on the side of the unit where the AC plug is located. Ensure the power cable is connected to the supply & Press the test button to test the PSU.
  • If the PSU LED does not illuminate, remove the PSU cables from the system board and test again. If the LED still does not illuminate when the test button is pressed, the PSU is possibly faulty.
  • If after removing the cables from the system board and the PSU LED illuminates, one of the attached devices or components could be faulty. Remove all attached components, reattach the PSU cables and using the PSU test button, install each component individually to test.
  • Install a verified working PSU.

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4. No Video issues

Power Button Status Possible Cause Troubleshooting Steps
Steady White The system is fully functional and in the On state.
  • Ensure that the display is connected to the correct port and powered on.
  • Ensure the display data cable is not damaged and replace if necessary.
  • Ensure the correct Input Source on the display is correctly selected.
  • Remove the data cable from the system. A Self Test box should appear on the display.
  • If the Self Test box does not appear on the display, replace the display with a verified working unit.
  • If there is still no display showing, check if video was shown during the POST routine.
  • If video was shown during POST, the display or graphics driver could possibly be the cause.
  • Restart the system into Safe Mode. To load Safe Mode, press and hold the F8 key as your system restarts.
  • This will load the Advanced Boot Menu. Select Safe Mode. Install the current versions of the display and graphic card drivers. Restart the system normally and check for video.
  • If available, replace the graphics card with a verified working card.


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5. Beep Codes & Error Messages

Please refer to the article on Beep Codes and Error Messages for further information.


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6. Dell Diagnostics

Dell Enhanced Pre-boot System Assessment, ePSA has been significantly improved with a view to streamlining the entire diagnostic process.
During the boot process, ePSA is accessed from a cold boot by pressing the power button ON and repeatedly press the F12 key until the BIOS Boot Menu appears on the screen.

Use the keyboard up and down arrow keys to select Diagnostics on the menu and press the Enter key. ePSA begins by checking an area in system memory to insure it is safe and then loads itself into the verified memory area. ePSA then automatically begins high level algorithms on all system memory to insure integrity. ePSA next creates a graphical menu listing all discovered devices in the system.

Note: Here are some things to remember when running the ePSA Diagnostics.

  • While the tests are running, the pointer (mouse or touch pad) is disabled. To exit the tests, press <ESC>.
  • The version number of the ePSA Diagnostics is displayed in the lower right-hand corner of the screen.
  • The activity indicators (bars) that appear during the memory tests are not used as an indication of progress. They show the location of the memory being tested.
  • Any errors along with the error code are displayed on the right side of the screen under the Results Window. A pop-up message also appears if a test fails.

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Article ID: SLN142546

Last Date Modified: 08/04/2015 04:16 AM


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