Dell ND224 manual Ensure that no special memory module/memory, Are compatible with your computer

Light Pattern	Problem Description	Suggested Resolution
	Memory modules are detected,	• Ensure that no special memory module/memory
	but a memory configuration or	connector placement requirements exist.
	compatibility error exists.	• Verify that the memory modules that you are installing
		are compatible with your computer.
		• Reinstall the memory modules and restart the computer.
		• If the problem persists, contact Dell.
	Routine system activity	Watch your monitor for on-screen messages.
	preceding video initialization.
	A possible expansion card failure 1 Determine if a conflict exists by removing a card
	has occurred.	(not a graphics card) and restarting the computer.
		2 If the problem persists, reinstall the card that you
		removed, remove a different card, and then restart the
		computer.
		3 Repeat this process for each card. If the computer starts
		normally, troubleshoot the last card removed from the
		computer for resource conflicts (see "Resolving Software
		and Hardware Incompatibilities" on page 32).
		4 If the problem persists, contact Dell.
	Routine system activity	Watch your monitor for on-screen messages.
	preceding video initialization.
	The computer is in a normal	None.
	operating condition after POST.

NOTE: The diagnostic lights flicker briefly; they are turned off after the computer successfully boots to the operating system.

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