OK, I took my brothers HD out and installed in my machine and did a clean install of xp home and everything was good. I took it out and installed it in his HP P3,500mgh,256ram. The power supply starts the cooling fans run, the HD spins but its like there is no video attached. Its onboard video so I took my good pci card and installed in the HP and got the same results. Like there is no video. It doesnt even show the bios or startup screen to get into setup. No beep codes at all either. Any help would be appreciated. p.s. put HD and video card back in my machine and everything still good.