Computer keeps restarting while I'm using it.

taternator24

Honorable
Jan 22, 2014
6
0
10,510
I'll be using my computer usually playing a game, but sometimes just surfing the internet and then boom. black screen, then my computer restarts up on it's own. I've tested my memory using windows diagnostic tool, I've pulled the PSU out and tested the voltages with a voltmeter, I've checked system files with windows the windows file checker. Any ideas what else it might be?
 
Fans for the PC are often built rather cheaply....and if they lose their ability to move air because of a malfunction, heat can increase. Also, components do fail - sometimes they are not a 100% failure, and those intermittent failures, especially when temperature related, are difficult to diagnose....