I would NOT try to stop the cpu fan. AMD chips run very hot and one little mistake with the cooler setup could cause immediate disaster.
My processor fan usually runs at 6250 rpm.
Antec makes 'silent' power supplies. Check for these and other brands with Google.
I have a custom-built computer with an ASUS A7N266-VM motherboard, AMD Athlon XP 2000+ processor. My sister recently bought a Dell Computer, and I am very envious of how quiet her computer is compared to mine. I added an exhaust fan to my computer shortly after I bought it, luckily the extra fan didn't increase the noise any. I believe the noise (typical computer loud hum) is coming from either the power supply or the CPU fan. Would it harm anything if I opened up the case with the computer running and stopped the CPU fan with a plastic pen or something similar for a second or two to see if that's where the noise is coming from? CPU fan is running at about 5800 RPM's, seems a little high compared to some other CPU fan's I've seen on the Internet, is that a typical speed? If it turns out that the noise is coming from the power supply, what should I look for in purchasing a quieter one? Any brand recommendations, or any other advice on reducing noise would be greatly appreciated.