One of my friend's pc has got the prob. His mouse does not work after the pc restarts. And when the pc is restarting the bios sometimes boot lately and then the problem occurs. That is, when the bios screen appears lately the mouse does not work. Windows starts normally and the keyboard works properly but the mouse does not work. No message appears informing that "hardware missing" or something like that.
Sometimes the DVD does not work either after the pc functions for sometime.