PC crashing when playing games

Hey guys recently my computer has decided to stop playing games. I get about 2 mins max then my pc crashes. The screen turns off and sound produces and stutering type noise.
Btw I play games like, Grand theft auto V, Counter Strike Global offensive etc.
Any solutions?

Specs:
operating system: Windows 10 build 10240
processor : intel core i7-3770 CPU @ 3.40GHz 3.40GHz
memory : 16 GB Ram
running: direct x 11
video card : AMD Radeon HD 7990
 
Following in order I would do them.

Heat? Clean out dust bunnies, check all fans turn, clear cables out of ventilation path, check for loose heatsink cpu & gpu, monitor temps with utility.
BSOD? STOP codes? Share screenshot, review mini-dump.
Event Viewer? Check for interesting errors.
Memory? Memtest86: 7 passes
HDD? SMART, manufacturer's utility
CHKDSK /r
SFC /scannow
 
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