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Advanced Troubleshooting 49
Advanced Troubleshooting
Diagnostic Lights
To help you troubleshoot a problem, your computer has four lights labeled "A," "B," "C," and "D"
(see page 65) 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 9.
Light Pattern Problem Description Suggested Resolution
The computer is in a normal off condition
or a possible pre-BIOS failure has
occurred.
Verify that the computer is plugged into a
working electrical outlet and that you
have pressed the power button.
A possible processor failure has occurred. Reinstall the processor (see page 93) and
restart the computer.
Memory modules are detected, but a
memory failure has occurred.
1
Reinstall all memory modules (see
page 73).
2
Ensure that all the connector tabs are
locked.
3
Restart the computer.
4
If the problem persists, contact Dell
(see page 112).
ABCD
ABCD
ABCD
= yellow
= green
= off
T2310bk2.book Page 49 Thursday, February 5, 2004 10:00 AM