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Asked: 2021-12-06T00:08:36+00:00 In:

Solved Computer Won’t Turn On, Half Second Movement Of CPU Fan Only

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I press button button, and i get nothing, no display or lights. Opened the side case, is a light on the motherboard, so it is getting power. Tried turning on the PC again. Notice the CPU fan spins for half a second and stops.

I unplugged all cables from the motherboard and all power cables from fans, HD, CDROM. Tried turning the computer on again, by using screw driver to short the power switch pins. Does the same thing, CPU fan spins for half a second and stops.

Not sure what else to do. Getting a another spare PSU to test with it later.

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    1. Best Answer
      The light on the motherboard is probably just a 5 v LED. That doesn’t mean your PSU is good as it must provide several different voltages at sufficient current for the PC to work.

      When a PSU does what yours is doing it’s usually because the PSU is detecting a problem with the motherboard and shutting off. Or it means the PSU is bad or going bad and only thinks there’s a problem with the motherboard. Or it means both are bad.

      So there ya go.

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