recently i started hearing a very high pitched buzzing coming from inside my case. after disconnecting all my fans but the CPU fan, and unplugging both harddrives, the floppy, and the CD drive, i still heard it. so i stopped the CPU fan briefly using my finger, and yep, still heard it. from my troubleshooting, i can say that this noise is obviously not caused by moving parts. it sounds almost like an electrical oscillation. i cant be 100% certain, but i dont hear it coming from inside the power supply. it sounds as though its coming from the motherboard itself, either from where the big power connector goes in from the PS, or from the area that has the CPU socket. i have an Asus A7N8X-E Deluxe motherboard. i also tried removing my ram, since its in the area, and still got the noise. is it possible that my motherboard is dying? or perhaps the power supply (which is a cheapo sort) is just feeding it bad power? http://www.aezay.dk/imgs/asus-a7n8x... i hear it coming from the region of this picture to the right of the North Bridge heatsink. none of my capacitors look bulged, and i poked each of those copper coil windings, and none were hot, or vibrating. although im no expert on them, maybe those arent good ways of testing copper coil windings :) the noise also gets louder and higher-pitched when the computer is drawing more power, like when i start a full screen game like Half Life 2. i could say the noise might be coming from the vid card, but its not coming from that section of the case. anyone have any ideas/input? - Dave

Try swapping the Power supply with another and see if that does it " If at first you don't succeed, Please Post Back "

swapping out the power supply seems to have solved the problem, although im still positive the noise wasn't actually coming from the bad power supply. could the bad power supply have been feeding those power filtering circuits on the motherboard dirty power and causing them to buzz like that? Dave