Diagnostic Lights; System Lights - Dell Dimension C521 Service Manual

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
Off The computer is in a normal "off" condition or in a power-
conserving mode.
Solid green The computer has successfully booted and is operating normally.
Blinking The computer is in a Windows standby power-saving state (S1 or
green S3).
Solid Amber A pre-POST failure has occurred. The system has received a
Power Good signal from the power supply.
Blinking A possible power supply failure has occurred. The system has not
Amber received a Power Good signal from the power supply
Hard-Drive Problem Description
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
might also be on when a device such as a CD player is operating.
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
The computer is in a normal condition or a
possible pre-POST failure has occurred.
The computer is in recovery mode.
A possible processor failure was detected.
Memory modules are detected, but a memory
failure has occurred.
A possible graphics failure has occurred.
A possible floppy drive or hard drive failure
has occurred.
Suggested Resolution
None. Press the power button to wake the computer or to turn the
computer on.
None.
None. Move the mouse, press the spacebar, or use another device that
has been configured as a wake-up device to wake the computer.
See

Diagnostic Lights

If this does not resolve your problem, contact Dell. For information about
contacting Dell, see your Owner's Manual.
Plug the computer into a working electrical outlet.
Suggested Resolution
See System Lights.
None.
Contact Dell. For information about contacting Dell, see your Owner's Manual.
If you have two or more memory modules installed, remove the modules, reinstall
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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
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(see Memory).
If the problem persists, contact Dell. For information about contacting Dell, see your
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Owner's Manual.
If the problem persists, contact Dell. For information about contacting Dell, see your
Owner's Manual.
Reseat all power and data cables and restart the computer.
for more information.
Suggested Resolution
No corrective action is
required.