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Dell dimension diagnostic lights

Mike_Sumner
Mike_Sumner asked
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Last Modified: 2012-08-13
I have a Dell Dimension 2400 desktop that has been having a lock up issue.
The powerlight turns orange and the hard drive activity light goes solid green.
The computer does not power down but is completely unresponsive.

On the back of the CPU just below the mouse/keyboard inputs there are four diagnostic lights labeled as "A,B,C,D". A,B,C are lit solid orange and D is off.

I have the Dell Diagnostic lights chart form the Dell website but this light combination is not listed.

I have repalced the power supply and did reseat all of the memory / CPU / and cables.
The same problem still happens after 24 to 36 hours. All fans are working properly.

Does anyone have any idea what the lights mean on the back? Dell can't help and I can not find this specific sequence anywhere on the internet.

Thanks in advance!
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