I recently rebuilt a computer that had a P4 3.2 Ghz, 2 Gb ram, and windows XP. I put in an asus p5n-e sli motherboard, 6 Gb of ram, and an intel celeron E 3200 2.4 Ghz dual core. The computer is my parents, and the new parts are from my computer that I just upgraded. After I installed the new parts, windows would not start, nor would it boot to a disc to attempt repair. I put the hard drive into my computer to get the files that I needed off of it, then wiped the hard drive with it installed in my computer. I put the freshly wiped drive into the other computer in which I would receive "boot mgr not found ctrl + alt+ del to restart" I then tried to install a fresh copy of windows 7 thinking that boot mgr is part of windows. I tried to boot to the install cd, it loads the files, but then just sits at the starting windows screen and does nothing. I put the hard drive back into my computer and installed windows 7 on it from there, then put it back into the other computer. I still am getting the "boot mgr not found" message and it will not boot to windows. It still will not boot to any disc, even a windows repair disc did not work. If i put the drive into my computer, it will boot just fine. I don't know whats going on!!