Quick Reference Guide

34 Quick Reference Guide
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 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. If the POST portion of system boot completes
successfully, all four lights display solid green for a short time, and then turn off. If the computer
malfunctions during the POST process, the pattern displayed on the LEDs may help identify where in
the process the computer halted. If the computer malfunctions after a successful POST, the diagnostic
lights do not indicate the cause of the problem.
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 completes the
POST portion of system boot and starts
loading 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.
For information on reinstalling
the processor, see your online
User’s Guide .
book.book Page 34 Friday, August 25, 2006 2:27 PM