Pc turns off itself while gaming

Vismajor

Reputable
Oct 7, 2015
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4,510
So i just came back from america after 4 months, everything was working smoothly when i left
But not now..
When i'm playing cs:go the PC turns off itself randomly. Completely dark, like just plugged out.
I can turn on instantly and it runs again, this crash enver happens while browsing (i don't play any other game)
My pc:
Giga 970a ud3p MB
giga r7 260x vga
fx-6300 proc
ctg-500 Chieftec PSU

GPU temp while furmark: 74 C max
CPU temp while IntelBurn: 70C max
I know that the CPU temp isn't ideal but it was while my proc was on full performance, and it didn't shut down my system.
What the heck could be the problem?
I cannot try a new PSU, i don't have anything powerful like that at home.