I am a tech at a Circuit City. I currently have a HP 752N that needed a new Hard Drive to function correctly. Installed that, now when i try to re-install Windows XP, the computer will randomly shut off. But...the hard drive is still on. The computer still has power, but it stopped sending power to anything else. Could this be a Power Supply problem? Or is it some sort of loose circuit on the motherboard? Any help regarding this matter would be great!