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Diagnostic Lights
To help you troubleshoot a problem, your computer has four lights labeled "A," "B," "C," and
"D" (see page 78) on the back panel. The lights can be yellow or green. When the computer
starts normally, the lights flash. After the computer starts, all four lights display solid 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 on page 13.
Light Pattern
A
B
A
B
A
B
= yellow
= green
= off
60
Advanced Troubleshooting
Problem Description
The computer is in a normal off
condition or a possible pre-BIOS
failure has occurred.
C
D
A possible microprocessor failure has
occurred.
C
D
Memory modules are detected, but a
memory failure has occurred.
C
D
Suggested Resolution
Verify that the computer is plugged
into a working electrical outlet and
that you have pressed the power
button.
Reinstall the microprocessor (see
page 107) and restart the computer.
Reinstall all memory modules (see
1
page 86).
Ensure that all the connector tabs
2
are locked.
Restart the computer.
3
If the problem persists, contact
4
Dell (see page 129).
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