Stop all the fans and start them spinning one by one. (you'd better do the one on the CPU first, with no applications running to be safe).
You shoul be abale to narrow it down to what's causing the sound, because if it isn't a speaker then it's movement of air inside the computer.
I used to cut the grill of the back of my PSU fan as the obstructive grill caused noise.
~ Boli
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1800+ @ 2247 (214x10.5) - STABLE, 512MB PC3700 TwinX Cosair RAM, NF7-S v2.0, GeForce3 Ti200
Parallel BIM, 120.1 Thermochill, Eheim 1048, Maze 3, Maze4 GPU, "Z" chipset, 1/2" tubing, PC-70: 5x120mm & 9x80mm fans.
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