I've been trying to nail down a problem with a new system that I've built:
Motherboard: Abit VA-20
CPU: AMD Sempron 2200+
The Sempron was in a retail kit, i.e., I have the stock AMD heatsink/fan, and the system is not overclocked at all.
When I originally put the system together, I noticed that after the system was on for awhile, I'd hear a high-pitched whistling or squealing sound. I've been trying to figure out where this is coming from for over a week now, and have done or looked at everything that I can think of.
At this point, I am getting the sound even with everything (the drive AND the CPU fan) powered off, so it's not those.
I've also checked the toroids on the board, and the sound is not coming from them.
I have a recording of the sound at: http://members.cox.net/ohaya/AbitNoise.wav
The above recording was done with everything, INCLUDING the CPU fan, disconnected/powered off. The only thing that was on was the power supply.
I pulled the motherboard and power supply out of the case this weekend, and was still able to hear the sound, although it was much lower in volume.
With the board out of the case, and with the CPU fan powered off, I did some testing by physically blocking off different parts of the motherboard with some sound-deadening material, and it appears that the sound is emanating from either the CPU itself or something within the footprint of the CPU socket (there are some components under the overhang of the CPU socket).
I had wished that I had a completely different CPU chip to try with this board, to see if I was only getting this sound with the Sempron, but the Sempron is the only CPU that I have to spare.
In researching this problem, I've found a number of forums, etc. where users are reporting some kind of squealing or whistling sound. Sometimes it is something external (drive, power supply, CPU fan) or from the toroids on the motherboard, but there are also some, like mine, that just seem to come from the CPU itself.
Has anyone else noticed this with their Semprons? Any ideas of what might be causing this sound?