Dell Dimension 2400 Diagnostic Lights and Troubleshooting guide


source: http://support.dell.com/support/edocs/systems/dim2400/en/sm_en/advtshoo.htm#1105412

Diagnostic Lights
To help you troubleshoot a problem, your computer has four lights labeled “A,” “B,” “C,” and “D” on the back panel. The lights can be yellow or green. 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.

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