My pc shuts down randomly with no warning, then attempts restart twice before successfully restarting. After it has restarted it acts completely normal and then shuts off again. There is no predicting when it will turn off. Sometimes it happens several times a day, and sometimes it works fine for several weeks. Does anyone know the possible reason for this?
I would run HWinfo and look at the temps and the voltages.
In general you want your CPU temp below 70C and the GPU temp below 80C under heavy load.
You want the voltages to remain within 5% of +12, +5 and + 3.3 both at idle and under heavy load.