Is your computer running fine otherwise when you hear the sound? Is it a continuous high pitched noise? Does it occur as soon as you boot up?
There is usually either a small speaker attached to the case (usually the bottom) or a piezoelectric one on the motherboard. You can easily determine if one of those is the source.
Another possibility is the hard drive, which should also be fairly easy to determine. If you can't tell, it might be necessary to disconnect it temporarily.
Those are just the more common ones (if you're sure it's not any of the fans), but it's hard to say without actually hearing the sound. Post back if you need any further help.
Hi,im not very good at computer. For the past few days my computer has been making this high-pitch sound which is driving me totally insane!. I have no idea what is making this sound and i am definitely sure it is not caused by my fans as i have tested them all, its not my Monitor either. Could it be my PSU?, CPU?, Motherboard?, GPU? i have no idea so please tell me what to do, thanks!
Oh and here are my specs
MOtherboard: Asus P6T deluxe v2
PSU: Cooler Master UCP 900W
GPU: Nvidia GTX 285
Harddisk: 1TB SATA HDD
RAM:6GB ddr3 1600mhz
OS: Vista x64
CPU: Core i7 920 @ 2.67ghz