Diagnostic Lights - Dell Dimension 4550 Series Owner's Manual

60
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 78). 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 on page 9.
Diagnostic Code Definition
Memory modules
Y Y G G
are detected, but a
memory failure has
occurred.
A B C D
Memory modules
G Y G Y
are detected, but a
memory
configuration or
A B C D
compatibility error
exists.
Corrective Action
• If you have one memory module
installed, reinstall it (see page 92), and
then 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
identify a faulty module or reinstall 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 116).
• Be sure that there are no special
memory module/memory connector
placement requirements (see page 92).
• Verify that the memory modules that
you are installing are compatible with
the computer (see page 107).
• If the problem persists, contact Dell
(see page 116).