The computer boots windows, I open a program and then the computer shuts down, the screen goes blank, and the green light stays on. I hit the shift key, move the mouse, hit the keyboard but still no change. It makes no noise, or beeps, nor does it give any error messages. Initially, I thought that the processor was overheating, so I placed a fan over it to keep it cool, but it still happens. It can be anywhere from 5 to 15 minutes before it shuts down. After the initial shutdown it must be unplugged before it will boot again but shutdown time gets smaller and smaller after that. Sometime it won't even make it thru a complete boot process. From my reading it appears to be the onboard video, but I needed to ask to see if someone else had encountered this problem.
My niece and I really appreciate your offer of assistance.