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Could a faulty fan cause my pc not to switch on

When switching on my PC, the power light and keyboard lights come on for 1 second and go off again but my PC does not switch on. Could it be my fan that is causing this?

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  • marvinm63 Nov 25, 2008

    I have tried a new power supply but the problem still persists, the fan will go on, spin but then go off immediately. There is a contineous clicking/popping (not a beeping) sound after this. What could cause this?


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Normally the computer will still come on even if the fan is not there but then will sometime display cpu fan warning and then sometimes turn off depending on motherboard and so on but unless the fan wires are shorted out or something this is most likely not the case

It sounds like your power supply has gone bad
Do you hear any type of winning sound or like a discharge sound that is barely noticeable when you turn it on? You would probably almost have to put your ear right next to it to hear it or listen carefully when you press power because that sound is one of the capacitors in the power supply that has gone bad and the power supply would need to be replaced

Do you have another power supply you can use to see if it works with a different one?

Posted on Nov 25, 2008

  • Darren Kessinger
    Darren Kessinger Nov 25, 2008

    oh I hate to be the barer or bad news but it is very possible that your CPU is dead.

    Try it with out the cpu in it at all and see if it does the same thing since the power supply will turn the board on and run the fans even without the cpu but that is all it will do...And if the fans spin and stay on without the CPU in it and then turn off again the same after reinstalling it then chances are CPU has problem or possibly one of the capacitors on the motherboard has gone bad see this pic for guide

    have you tried removing the heatsink right away and checking to see if the cpu is warm at all?

    if it is ice cold then chances are it is not working. But when the system barely turns on for a sec then turns right back off allowing the fan to only spin for a few seconds then 9 times out of 10 i have seen it being the CPU that went bad usually from overheat due to dust build up between the can and the heatsink that is usually hidden underneath the fan or a few rare occasions when caps on MB went bad

    But don’t give up yet i would recommend trying these few ideas then if still no lock i will try to help you diagnose it further.

    one more test would be if it is a P4 then try unplugging the 4 wire cpu power plug from the board and see if the fans stay on (and of course the computer will not work without that being plugged in but if it does continue running without it and then does not work the next time after plugging it back in then chances are the one of the capacitors near the cpu have gone bad. and cpu might be fine.

    i hope that all makes sense and is helpful in some way


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