"Why does my computer unexpectedly restart on its own?"에 답변If your system shuts down after being turned on awhile it could be your fan is not functioning. It may be burned out, or mechanically seized up or your thermostat on the motherboard may be malfunctioning. This happened to my system and it turned out to be mechanically seized up,lucky me. Find dismantling instructions , be very careful removing things. The break easily. Especially connectors and the volume control on the motherboard.