Dell optiplex diagnostic lights

diagnostics lights on the optiplex 330 1 is flashing and 2 is off. what do this lights stand for
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  1. I would recommend you go to Dells website to obtain the manual for your specific system.

    Here's the link:

    Click on the choice to "Choose by service tag" and enter your service tag. Then download the manual for it. In the manual will be a section about diagnostics and diagnostic lights.
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