I have a computer with a P5A MOB that will just shut down all of the sudden. The computer has been running fine for 3 years without any problems. Changed the power supply, because the first time it did it, I could not even get it to restart by pressing the power button. Then with new power supply it booted fine and ran for 30 minutes or so and did it again. That's when i realized if i unplug it for a moment then press power button it would start. But now it will make it to windows sometimes and then shut down, and sometimes it won't even make it to windows before it does it. Any siggestions would be greatly appreciated. Thanks in advance, Todd A