8/31/2023 0 Comments Hard drive with windows 7![]() ![]() If the power supply diagnostic light next to the switch illuminates, the problem may be with your system board. Press and hold the power supply test button on the back of the power supply unit. Power off computer, leaving the computer plugged in. If it does and you have a multimeter you can test the PSU according to the below video. I don't know if Dell uses a standard 24pin power connector to the MB on this computer. By Troubleshooting manual you mean the Service Manual, correct? Did you disconnect the power supply from the MB and then press the power supply button.
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