Hi, does anyone know which component is causing my iMac G5 to whine like a cat?

As it does more processor intensive tasks it gets louder, and it sounds like a fan, but I tried running it open and holding all the visible fans and the noise was still there. Power Supply?

What component in the power supply could it be? and how do I fix it?

Arhh this Mac has power supply AND cap issues... :simasimac: :disapprove: