High pitched noise from the power supply when PC off

ikshaar

I just want to know if anyone have a clue why a power supply would emit a very high pitched noise (not fan noise, more like electric whining) when plug-in even if computer is off. And if I should worry about it ?

PSU is an Antec Smart Power 450W.
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coplaniuk · Posted: Mon May 21, 2007 4:52 pm Post subject:

I would be a bit concerned, especially if it lasts more than a few minutes. Some power supplies will keep their fans running after they power-down. That may be what you hear (and maybe it needs a good dust-blowing).

If it's constant...the power supply may be failing -- a failing capacitor or something.
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eccerr0r · Posted: Mon May 21, 2007 5:08 pm Post subject:

The standby power is always on - it's definately not "normal" as most powersupplies are just about silent even when "on" in standby state. However it's indeterminate if the p/s is good or bad, purely annoying - probably should ask for a swap saying the noise when "off" is botherring you.

Does it still make the noise when the ATX connector is unplugged from the motherboard?
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