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Advanced Troubleshooting
Diagnostic Lights
To help you troubleshoot a problem, your computer is equipped with four lights on the back panel
labeled "A," "B," "C," and "D" (see page 57). These lights can be yellow or green. When the
computer starts normally, the lights flash. After the computer starts, the lights remain green. If the
computer malfunctions, the color and sequence of the lights identify the problem.
CAUTION:
Before you begin any of the procedures in this section, follow the safety instructions in the
Product Information Guide.
Light Pattern
Problem Description
The computer is in a normal off
condition or a possible pre-BIOS failure
has occurred.
A B C D
= yellow
= green
= off
Suggested Resolution
Verify that the computer is plugged
into a working electrical outlet and
that you have pressed the
power button.
Advanced Troubleshooting
43
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