Question When I play game after hours the PC crashes the screen turns red sometimes green

Feb 22, 2019
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When I play games after hours the PC crashes and the screen turns red or green remains like this for 1 minute and then restarts automatically. Where is the problem? I run tests on gpu it runs without any problem.

My pc specs: Intel i5 6500
Motherboard: asus 150-B
Gpu: gigabyte 970 4gb
Psu: 600w Corsair.
( I plugged 4 fan cases 120mm)

Ps: my gpu gets hot when I’m in game and I increase the gpu fans to 60% so the temperature is about 65c