Dell T3400 manual 102

Light Pattern	Problem Description	Suggested Resolution
	A possible USB failure	• Reinstall all USB devices, check cable
	has occurred.	connections, and then restart the
		computer.
		• If the problem persists, contact Dell
		(see "Contacting Dell" on page 269).
	No memory modules	• If two or more memory modules are
	are detected.	installed, remove the modules (see
		"Removing a Memory Module" on
		page 160), then reinstall one module
		(see "Installing a Memory Module" on
		page 160) 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
		"Memory" on page 157).
		• If the problem persists, contact Dell
		(see "Contacting Dell" on page 269).
	System board failure	Contact Dell (see "Contacting Dell" on
	has occurred.	page 269).
	Memory modules are	• Ensure that no special requirements
	detected, but a	for memory module/connector
	memory	placement exist (see "Memory" on
	configuration or	page 157).
	compatibility error	• Ensure that the memory you are using
	exists.	is supported by your computer (see
		"Memory" on page 33).
		• If the problem persists, contact Dell
		(see "Contacting Dell" on page 269).
	A possible system	• Perform the procedures in "Restoring
	board resource and/or	Your Operating System" on page 136.
	hardware failure has	• If the problem persists, contact Dell
	occurred.
		(see "Contacting Dell" on page 269).

102

Troubleshooting Tools