This is the third time this has happened. I am online doing whatever, and then all of a sudden bam the computer screen turns off and the computer shuts it self down. But it doesnt shut down and turn off, it just shut downs. The power is still on, but it will not restart. I turned off the red master button thing and then back on. The monitor turned on but did not display anything. The green button on the bottom went yellow, idle I guess. So I returned off the red button, took the monitor power cable out then in and everything worked again. Was could cause this. This time today, it turned off once I clicked the mouse.