high tone while pc is turned off

[okeee]

When I turn the pc off, I still hear a high tone pinch sound, I'm not sure where it comes from. And only when I turn off the power supply as well, the sound dissapears. So what is this sound and what part does it come from? The videocard has already been removed.

[mjc]

How loud is it?

[okeee]

it's not very loud (but you can clearly hear it) but the sound is uninterrupted.

[mjc]

I'd say it is probably the power supply...and it is not a good sign when the power supply is making any kind of noise other than the sound of moving air/a fan.

[saphalline]

Sounds like (no pun intended! :p) one of the circuits inside the PSU has gone bad. I would suggest you replace it.

[PrntRhd]

It is either a bad fan in the PSU or bad capacitor in the PSU per your description of symptoms.

[okeee]

I checked the capacitors, but there was no goo coming out. I listened more closely and the sound seems to come from the power supply. What does this mean? When I turn the power supply off, the sounds brakes down like a motor when it's coming to a halt, and then it's quiet.

[mjc]

Time to replace the power supply...