My computer sounds like it's dying. Or at least in severe pain. I've narrowed down the sound to the CPU fan, which obviously isn't a good thing. Every once in a while it starts grinding. It actually sounds like it's screaming "NOOOOOOOOOOoooooooooo" at five-second intervals. It's very disturbing and it gave me a bit of a headache all of last weekend. Today I pried the heck out of the fan with a screwdriver and now it's a bit quieter for the time being.
My CPU temperature stays around 36 Celcius at idle and never higher than 52 Celcius while compiling a big package so I think the fan is actually functioning fine. But I'm still waiting for the day when I come home from work and find a smoldering puddle of metal where my CPU used to be. I'm almost hoping it happens, so I have an excuse to buy a faster CPU. I got my AMD 64 X2 3800 last summer and already it's pretty much a dinosaur.