Perhaps its your psu or the woofer assuming you have one.
Not 1 week before, there was a strong buzzing noise, in fact if you stayed for about 10-20 minutes inside the room, after that your head started aching.
Turns out it was the woofer.
Some screws had gone loose, by the time i gave them a push with the screwdriver the sound was gone.:cool:
Cpu:x4 640 @ 3.75ghz// Mobo:ga-880gm-ud2h// Ram: kingston 2x2gb// Psu: Chieftec aps-500w
Hdd: Caviar Blue 500gb// Case: Silverstone ps05// Monitor: Lg Flatron w2241s// Gpu: Amd Sapphire 6790//