Follow up question to a previous one..... is the fan on a computer power supply controlled by any software/firmware or is it always on as soon as the PC is powered up?
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Anonymous
ANSWERS: 4
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they are usually just wired straight into the 12v circuit in the power supply unless it is a posh one with a speed adjustment on the back. if its going round too slow or is too loud it is probably worn out, the annoying thing about that is unless your seriously good with electronics you have to replace the whole power supply as it is dangerous to take it apart.
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Some fans come equipped with thermoresistors that regulate voltage to the fan based on how hot or cold the Thermistor gets. A Thermistor changes it's resistance as heats and cools, allowing for more or less electricity to flow past it; Thus adjusting the speed of the fan, all with out any software or computer control.
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If the fan has stopped moving then you need a new power supply. You could replace the fan, but it's not much cheaper than the whole PS. also the fan will be sodiered not plugged into the ps. so just replace it.
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I believe it is on as soon as you turn on power.to keep the system cool.if it overheats then you could have major problems with your pc. I read about it in one of those pc books. I don't know what would be more expensive though,buying a new pc or taking it to have it fixed.
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