Dell GX520 Ensure that no special memory, Verify that the memory modules that, Your computer

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Light Pattern	Problem Description	Suggested Resolution
	No memory modules are detected.	• If you have one memory module
		installed, reinstall it and restart the
		computer. For information on
		reinstalling memory modules, see your
		online User’s Guide.
		• If you have two or more memory
		modules installed, remove the modules,
		reinstall one module, 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.
		• If the problem persists, contact Dell. For
		information on contacting Dell, see your
		online User’s Guide.
	Memory modules are detected, but a	• Ensure that no special memory
	memory configuration or compatibility	module/memory connector placement
	error exists.	requirements exist.
		• Verify that the memory modules that
		you are installing are compatible with
		your computer.
		• If the problem persists, contact Dell. For
		information on contacting Dell, see your
		online User’s Guide.
	A failure has occurred.	• Ensure that the cables are properly
		connected to the system board from the
	This pattern also displays when you enter	hard drive, CD drive, and DVD drive.
		• Check the computer message that
	system setup and may not indicate a	appears on your monitor screen.
	problem.
		• If the problem persists, contact Dell. For
		information on contacting Dell, see your
		online User’s Guide.
	After POST is complete, all four	None.
	diagnostic lights turn green briefly before
	turning off to indicate normal operating
	condition.

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Quick Reference Guide