Hi, Suddenly this morning my PC won't boot. I haven't changed or installed anything. The red HD activity light is constant, but there's no display, no beeps, nothing. I have removed the CMOS battery for 5 mins and also replaced it, but still nothing. It DID start once this afternoon just out of the blue. I shut it down, left it alone, but half an hour later it was broken again. Any help appreciated. Thanks. Ben.