Dell XPS 420 owner manual Ensure that no special, Requirements for memory, Exist see Memory on

book.book Page 78 Tuesday, November 27, 2007 10:29 AM

Light Pattern	Problem Description	Suggested Resolution
	No memory modules are	• If two or more memory
	detected.	modules are installed, remove
		the modules (see "Removing
		Memory" on page 108), then
		reinstall one module (see
		"Installing Memory" on
		page 106) and restart the
		computer. If the computer
		starts normally, continue to
		install additional memory
		modules (one at a time) until
		you have identified a faulty
		module or reinstalled all
		modules without error.
		• If available, install working
		memory of the same type into
		your computer (see "Installing
		Memory" on page 106).
		• If the problem persists, contact
		Dell (see "Contacting Dell" on
		page 200).
	Memory modules are	• Ensure that no special
	detected, but a memory	requirements for memory
	configuration or	module/connector placement
	compatibility error has	exist (see "Memory" on
	occurred.	page 104).
		• Ensure that the memory you
		are using is supported by your
		computer (see "Memory" on
		page 173).
		• If the problem persists, contact
		Dell (see "Contacting Dell" on
		page 200).

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Troubleshooting