i will explain the behaviors in need for speed underground 2, first the sound stops the keyboard stop working and the mouse stops and after a second a lockup and after 1 minute a bsod. in quake 4 the music stops the keyboard stops. but the game is working i can use mouse to turn-shoot a bsod didnt apeare. my mouse is conected on ps/2 port in the back, and my keybord is usb. the hard drive controllers the vga card the pci soundblaster 2 of 3 usb controllers share the same irq its 11 btw