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Is this a standard desktop with a ATX style motherboard? If so, you can google for "PSU Paperclip Test". Follow the directions, basically disconnect the power from the PC, open it up, remove the power cable from the motherboard and jumper two of the pins with a paperclip or similar. I'd have to look to see which pins. Then reconnect the power supply to power, and if the fan in it spins up, then you likely have a problem with the motherboard.
You might be able to just re-seat the connections and that would solve the problem.
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