Dell 4500C manual Diagnostic Lights, Diagnostic Code Definition Corrective Action

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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	Corrective Action
Y	Y	G	G	Memory modules	• If you have one memory module
				are detected, but a	installed, reinstall it (see page 90), and
				memory failure has	then restart the computer.
A	B	C	D	occurred.	• If you have two or more memory
					modules installed, remove the modules,

reinstall one module (see page 90), 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 90).

• If the problem persists, contact Dell (see page 105).

G	Y	G	Y	Memory modules
				are detected, but a
				memory
A	B	C	D	configuration or
				compatibility error
				exists.

•Be sure that there are no special memory module/memory connector placement requirements (see page 90).

•Verify that the memory modules that you are installing are compatible with the computer (see page 97).

•If the problem persists, contact Dell (see page 105).

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Advanced Troubleshooting