I have noticed lately that my computer is making a high pitch ringing/squealing noise. It doesn't sound like fan noise and I can't quite pin point the exact location that its comming from. What I do know know though, is that if I shut my computer down, the intensity of the sound is lower, but still present. If I flip the switch on the back of my PSU, the noise stops completly. Has anyone ever had this same problem? What could be making this noise inside the PSU, or could it be the motherboard making this sound, since power is still going to it when its on stand-by? Thanks for your help.