Seems to me that you two have differing ideas of what "boots up" means. I think BIGBL is saying the computer turns on but stops because it cannot find a hard drive to boot from. It could be the drive is bad, or perhaps a cable is loose or bad. Then again, could also be a motherboard problem (though not likely). I'd check the cables to the drive, both to make sure they're good and that they're firmly attached. If nothing still, attach the drive to another computer to see if it is detected. If not, the drive is toast. If so, could be a problem with the board.