Random colours on screen and then crash.

I just had a match in which my screen would randomly flash a bunch of colours before crashing to desktop where i then had to restart the game, but after a short while in game i got the same problem but this time it crashed my entire computer, It has happened before once, my games runs very smooth and my pc can run gigantic games such as witcher 3 and gta 5, Is there some setting or something that may be causing it?