High pitched sound from computer when off?

When i turned off my computer it had a high pitched sound coming from inside. I unplugged the power supply to see if the sound would stop since i've read that it could be that, but the sound continued. I did the same with the video and sound card and unplugged them one at a time and the sound changed to a lower pitch and not as loud as if almost not there, but was still there. Could it be the motherboard?

Answers:
Ooooooh... poltregeist =D

It could be something perhaps like static buildup on your MoBo's speaker terminal. *shrugs*

Try dismantling the whole thing (if you have the stomach for it) and give your parts a good run-down with an aircan - also wear an antistatic-wristband.

even then if it doesnt stop you'll have each part in your hand to pinpoint the source.
Yes, it could be coming from a problem with the motherboard. It's probably NOT a good sign. I see either a new system board, or else a new system, in your immediate future.

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