Question Computer reboots when I press play on games

Mar 16, 2019
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When I press play on TD2 and new world my computer pretty much instantly reboots.

I7-8700k
1080 ti
16 Gb Ram
 
Mar 16, 2019
3
0
10
No two games, TD2 and New world alpha.

Corsair 750 watt

The games were downloaded from their official sites

I have also already reset my computer and deleted every thing from my SSD and only have these two games installed on it. My drivers are all up to date.
 
Mar 16, 2019
3
0
10
Complete Spec-

CPU - I7-8700k
RAM - G.Skill DDR4-3200
MOBO - ROG STRIX z370-E
GPU - ROG STRIX 1080 Ti
PSU - Corsair RM850x (850 not 750 oops)

I have my OS on a mechanical and games on a SSD.
My CPU is on an enclosed liquid cooler.