My computer will shut off whenever i start a game

Mentocat

Honorable
Jul 4, 2013
2
0
10,510
So recently i put together my computer everything was working fine except i needed more cooling. I bought a case fan and put it in my pc.
I tried to start metro last light but the computer shut off before the menu could load.I ran stress tests and the only thing it failed on was Tessellation and DoF
When i checked for heat the area where the cpu and gpu are, were not hot.

Other games that shut off
-Minecraft
-Team fortress 2

PC Specs
GA-Z77X-UD3H (Motherboard)
EVGA GeForce GTX660
Thermaltake TR2 600 watt PSU
Intel i5-3570k processor
8 Gigabyte Ballistix RAM
Seagate 1 Terabyte HDD
Sandisk 120 gigabyte SSD
2 Case fans. (Front)1 Cooler master 140mm (Top) 1 Bitfenix 120mm