Diagnostic Lights - Dell MTC2 User Manual

Dell personal computer user manual
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Diagnostic Lights

To help you troubleshoot a problem, your computer has four lights labeled "A," "B," "C," and
"D" on the back panel (see page 74). 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
A
B
A
B
= yellow
= green
= off
56
Advanced Troubleshooting
Problem Description
The computer is in a normal off
condition or a possible pre-BIOS
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.
• If you have one memory module
installed, reinstall it (see page 92)
and restart the computer.
• If you have two or more memory
modules installed, remove the
modules, reinstall one module (see
page 92), and then restart the
computer. If the computer starts
normally, reinstall an additional
module. Continue until you have
identified a faulty module or
reinstalled all modules without
error.
• If available, install properly
working memory of the same type
into your computer (see page 92).
• If the problem persists, contact
Dell (see page 107).

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