Computer crash while gaming?

Ninjaante

Honorable
Nov 11, 2013
5
0
10,510
Hello, during the past week my computer have been crashing randomly while i've been playing Hearthstone or World of Warcraft. It starts by lagging for a few seconds then freezing my entire screen.

When i tried alt+f4 or ctrl+alt delete it doesn't work. Instead i get a black screen unable to do anything.

Any help is appreciated.