Dell 360 service manual Diagnostic Lights, 126

Code	Cause
4-3-3	Timer-chip counter 2 failure
4-3-4	Time-of-day clock stopped
4-4-1	Serial or parallel port test failure
4-4-2	Failure to decompress code to shadowed memory
4-4-3	Math-coprocessor test failure
4-4-4	Cache test failure

Diagnostic Lights

WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage on www.dell.com at www.dell.com/regulatory_compliance.

To help troubleshoot a problem, your computer has four lights labeled 1, 2, 3, and 4 on the front panel.

NOTE: If you are using an ultra small form factor computer, the diagnostic lights are present on the back panel. See the Setup and Quick Reference Guide that ships with your computer for more information.

When the computer starts normally, the lights flash, and then turn off. If the computer malfunctions, use the sequence of the lights to help identify the problem.

NOTE: After the computer completes POST, all four lights turn off before booting to the operating system.

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Troubleshooting