Anytime I play a 3d game, (i've tried UT, Deus Ex, Half-Life, and Carmageddon TDR 2000) after a short period of time (about 3 minutes) the sound stops working and all I hear is a high pitched very annoying sound. Sometimes the entire computer locks up also. Sometimes the game will continue to play but the mouse stops working and then after maybe 30 seconds of that, the entire computer locks up. This happens no matter what screen resolution I use and it happens with Direct3D and OpenGL.