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Power LED Light Status Possible Cause Troubleshooting Steps
+5VSB rail on the power
supply is working correctly.
• Ensure the main power
cable and front panel
cable are securely
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.
Diagnostic Beep Codes
Beep Possible Cause Troubleshooting Steps
1 BIOS ROM checksum in
progress of failure.
System board failure,
covers BIOS corruption or
ROM error
2 No RAM detected No memory detected
3
• Chipset Error (North
and South Bridge
Chipset, DMA/IMR/
Timer Error for Intel
platform); Chipset Error
• Time-Of-Day Clock test
failure
• Gate A20 failure
• Super I/O chip failure
• Keyboard controller
test failure
System board Failure
4 RAM Read/Write failure Memory failure
5 RTC Power Fail COMS battery failure
6 Video BIOS Test Failure Video card failure
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