Dell WHL 77, and then restart, Computer. If the computer starts, Module. Continue until you have

w w w . d e l l . c o m s u p p o r t . d e l l . c o m

Light Pattern			Problem Description	Suggested Resolution
			Memory modules are detected, but a	• If you have two or more memory
			memory failure has occurred.	modules installed, remove the
A	B	C	D	modules, reinstall one module (see
				page 77), 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 (see page 77).
				• If the problem persists, contact Dell
				(see page 131).
			A possible graphics card failure has	• If the computer has a graphics card,
			occurred.	remove the card (see page 87),
A	B	C	D	reinstall it, and then restart the
				computer.
				• If the problem still exists, install a
				graphics card that you know works and
				restart the computer.
				• If the problem persists or the
				computer has integrated graphics,
				contact Dell (see page 131).
			A possible floppy or hard drive failure	Reseat all power and data cables and
			has occurred.	restart the computer.
A	B	C	D
			A possible USB failure has occurred.	Reinstall all USB devices, check cable
				connections, and then restart the
				computer.

A B C D

= yellow = green = off

54

Advanced Troubleshooting