One day, my computer decided to shut down on me. I turned it back on, and it shut down at the windows loading screen. I prayed, turned it on again, and it turned off before it got past the bios load screen. Through testing, I've found that my desktop will shut itself off within a minute of turning on, and the time it stays on will decrease with each iteration. It doesnt matter if I'm in the bios, loading windows, or if I make it to the desktop; It shuts itself down. I know it's not the harddrive; I installed a windows7 on a different one and I was not only able to instal it, I got to the desktop. I turned it off to confirm it was working, and it wasnt. Any ideas or suggestions as to what is wrong with or what needs replacing in my computer?