Dell C521 System Lights, Diagnostic Lights, Power Light Problem Description Suggested Resolution

Configuration Displays your hardware configuration for the selected device.

The Dell Diagnostics obtains configuration information for all devices from system setup, memory, and various internal tests, and it displays the information in the device list in the left pane of the screen. The device list may not display the names of all the components installed on your computer or all devices attached to your computer.

Parameters Allows you to customize the test by changing the test settings.

Close the test screen to return to the Main Menu screen. To exit the Dell Diagnostics and restart the computer, close the Main Menu screen.

System Lights

Your power button light and hard-drive activity light may indicate a computer problem.

Power Light	Problem Description	Suggested Resolution
Off	The computer is in a normal "off" condition or in a power-	None. Press the power button to wake the computer or to turn the
	conserving mode.	computer on.
Solid green	The computer has successfully booted and is operating normally.	None.
Blinking	The computer is in a Windows standby power-saving state (S1 or	None. Move the mouse, press the spacebar, or use another device that
green	S3).	has been configured as a wake-up device to wake the computer.
Solid Amber	A pre-POST failure has occurred. The system has received a	See Diagnostic Lights for more information.
	Power Good signal from the power supply.
		If this does not resolve your problem, contact Dell. For information about
		contacting Dell, see your Owner's Manual.
Blinking	A possible power supply failure has occurred. The system has not	Plug the computer into a working electrical outlet.
Amber	received a Power Good signal from the power supply

Hard-Drive	Problem Description	Suggested Resolution
Activity Light
Solid green	The hard-drive activity light is on when the computer reads data from or writes data to the hard drive. The light	No corrective action is
	might also be on when a device such as a CD player is operating.	required.

Diagnostic Lights

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

To help you troubleshoot a problem, your computer has four lights labeled "1," "2," "3," and "4" on the front panel. When the computer starts normally, the lights flash. After the computer starts, all four lights display solid green. If the computer malfunctions, the color and sequence of the lights identify the problem.

Light Pattern	Problem Description	Suggested Resolution
	The computer is in a normal condition or a	See System Lights.
	possible pre-POST failure has occurred.
	The computer is in recovery mode.	None.
	A possible processor failure was detected.	Contact Dell. For information about contacting Dell, see your Owner's Manual.
	Memory modules are detected, but a memory	• If you have two or more memory modules installed, remove the modules, reinstall
	failure has occurred.	one module (see Memory), 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 Memory).
		• If the problem persists, contact Dell. For information about contacting Dell, see your
		Owner's Manual.
	A possible graphics failure has occurred.	If the problem persists, contact Dell. For information about contacting Dell, see your
		Owner's Manual.
	A possible floppy drive or hard drive failure	Reseat all power and data cables and restart the computer.
	has occurred.