I have Cooler Master GX lite 600w. It worked fine for 2 months, and now it makes this weird nose. Its not the fan broblem!
When I turn on the PC, then it starts making this nose and also the printer does the same thing in the same rythm. So the problem from PSU spreads across all house. I checked in different contact jacks. Tried different cabels and checked the wires.
I uploaded the sound : http://soundcloud.com/girtskagis/s2-11/s-ayzDW . I just wanted to know what electrical problem would cause this and is it harmful for PC and other devices.