Computer Crashes When Playing Games

[Terminator543]

Everytime I play a video game my computer shuts off after a few minutes of playing. It crashes no matter what game I play but it takes longer to happen with certain games. When i play BF4 it crashes immediately after joining a server. When i play Chivalry Medieval Warfare it crashes after about 5 minutes of playing.

I have checked to see if it was a problem with heat but my temps were very normal whilst gaming.

ok now my computer just instantly crashes as soon as a game opens.

 

[dominirican3351]

WHat is your full specs including psu maker, also what are the temps they might seem normal to you but could be bad. FInally is anything overclocked

 

[Terminator543]

WHat is your full specs including psu maker, also what are the temps they might seem normal to you but could be bad. FInally is anything overclocked

Specs
GPU: R9 280x
CPU: AMD FX 8350
Mobo: GA-78LMT-USB3
PSU: Sentey 725w Power Supply

As for my temperatures my GPU CPU and Mobo all sit at around 35-40 C and no, I'm not overclocking at all