Compuer turns off completely.. then restarts on it's own, then off again in Hardware Posted July 20, 2010 So my friend gave me his computer to fix, saying it doesn't turn on. First things first, I cleaned all the dust out, so it's brand new looking at least. I turned it on, and it ran to the "windows wasn't shut down properly' screen, so I chose last good configuration. It turned off, and then about 10 seconds later, it turned on. about 5 seconds after that, it turned off. I tried a couple more times, and same thing. He said this was what it kept doing. I can't get far enough to use the XP repair disk, because it usually shuts down before the bios screen displays itself. I've never come across this, so here I am. Anyone got any ideas?