My computer has suddenly been freezing. Or at least, I think it's freezing. I got a new mouse/keyboard combo a few days ago, and just today it's started playing up. First off, the mouse and keyboard seem to not work during boot-up, so I can't use them (maybe since they're both USB, I dunno, my old keyboard was PS/2). Then, when it freezes, it's completely unexpected. There's no indication, no errors messages, it just stops. But at the same time, the mouse and keyboard turn off, I can't even get the lock key lights to toggle. So it could be that the mouse and keyboard are just stopping, rather than the system freezing. Any suggestions?