Diagnostic Error Codes - Lenovo M55p - ThinkCentre - 8808 Hardware Maintenance Manual

3. There are three LEDs to help you determine if the power supply and system board are working correctly.
The power button LED is located on the front of the computer and the two diagnostic LEDs are located
on the power supply at the rear of the computer. After pressing the power button, observe the LEDs and
refer to the following table:
Green
diagnostic
Power LED LED
ON ON
OFF OFF
OFF (after the ON
power button
has been
pressed)
ON ON
If the Diagnostic LEDs are in the normal condition and the problem persists, replace the system board
and the microprocessor, one at a time, until the computer works correctly.

Diagnostic error codes

Refer to the following diagnostic error codes when using the diagnostic tests. See "Running tests" on page
43 for the specific type for information about the Diagnostic programs.
In the following index, X can represent any number.
Diagnostic Error Code
000-000-XXX BIOS Test Passed
000-002-XXX BIOS Timeout
000-024-XXX BIOS Addressing test failure
000-025-XXX BIOS Checksum Value error
000-026-XXX FLASH data error
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Hardware Maintenance Manual
Yellow
diagnostic
LED Action
OFF This is the normal condition of the LEDs when the power is OK.
OFF • Make sure the power cord is attached to a working electrical
outlet.
• Check the power cord for continuity.
• If the problem persists, replace the power supply.
OFF Replace the system board
ON Replace the power supply
FRU/Action
No action
1. Flash the system. See "Flash update procedures"
on page 375
2. System board
1. Flash the system. See "Flash update procedures"
on page 375
2. System board
1. Flash the system. See "Flash update procedures"
on page 375
2. Boot block
3. System board
1. Flash the system. See "Flash update procedures"
on page 375
2. Boot block
3. System board