Troubleshooting Tools and Utilities 317
Diagnostic Lights
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions
located in the Product Information Guide.
To help you troubleshoot a problem, your computer has four lights labeled "1," "2," "3," and "4"on the
front or back panel. The lights can be off or green. When the computer starts normally, the patterns or
codes on the lights change as the boot process completes. When the computer starts normally, the
patterns or codes on the lights change as the boot process completes. If the POST portion of system
boot completes successfully, all four lights display solid green. If the computer malfunctions during
the POST process, the pattern displayed on the LEDs may help identify where in the process the
computer halted.
NOTE: The orientation of the diagnostic lights may vary depending on the system type. The diagnostic
lights can appear either vertical or horizontal.
Light Pattern Problem Description Suggested Resolution
The computer is in a normal "off"
condition, or a possible pre-BIOS failure
has occurred.
The diagnostic lights are not lit after the
computer successfully boots to the
operating system.
Plug the computer into a working electrical
outlet and press the power button.
A possible BIOS failure has occurred; the
computer is in the recovery mode.
Run the BIOS Recovery utility, wait for
recovery completion, and then restart the
computer.
A possible processor failure has occurred. Reinstall the processor and restart the
computer.
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