[cly]

This problem just started. While playing the game Dirt 2 my computer starting making a high pitch buzzing noise. It comes in and out for a couple seconds. Since the sound is not sustained it is difficult to figure out where it is coming from. I installed heat sensing programs and my computer doesn't seem to run hot. I think the CPU gets up to about 40 C and the GPU gets to about 50 C. Anyone have any ideas what this may be? Thanks