Ok, i have a custom computer that i built not too long ago that has been working perfectly. This morning the computer was working, i left it on while i left the house, came back to the house like 6 hours later and the computer was turned off. So i turn it back on and it goes through the bios info and post messgase, then right before it is supposed to load windows xp, the screen goes blank, with a little curser blinking in the top left corner. The keyboard is unresponsive and I can't do anything on this screen except restart the computer manually. Bios is detecting the hard drives, theres no loose cables...i don't know what else to do. Please help.