when i turn on my comp it squeaks for a few secs and then comes bios logo and starts booting... and that was all for some time. today i turned on my pc and after windows boots it squeaks all the time with short pauses.. the sound comes maybe from cpu or something near, its hard to tell for sure. weird thing is that while cpu isnt stressed i hear that squeak, but when i turn on some cpu streesing program like Orthos, the sound dissapears. when i turn off that program sound comes again.. any ideas who might cause it?