When I turn my PC on, it will start booting up for about 2 seconds, turn itself off and back on again, and do it over and over. It does not get to loading the OS during this. This started yesterday, and I unplugged the computer overnight and plugged it back in, and it worked for a time and started doing this again. It is a decent computer, about 1 and 1/2 years old... I was going to reinstall Windows on it because it is loaded with junk, and it shut down during the installation... I have not added any new hardware lately... Thanks for any help