hey my teacher/coach's school computer (dell optiplex gx150) is stuck in a restart loop. When it boots up it will make it to the windows os load screen and then restart. i already tried all the settings in the F5 menu and none of them worked it just restarts again. p.s. I also see a blue screen flash on and off the screen b4 it shuts itself down and starts again. i need some major help on how to diagnose and fix the problem.