PC Restart randomly

Aug 9, 2018
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Hi,
for a few days I'm facing a problem. My computer is restarting itself without any explanation. Like, when that happen, all thing stop working (fans, leds, everything) and then it start. And i don't know what i have to do. And one more thing. And, When we started the air conditioning, the computer do the same thing. I thought it was too demanding and had no way to take it.
BTW, THAT HAPPEN ONLY IN GAMES.
ON A MOVIE OR SOMETHING LIKE THIS, DOESEN'T RESART.
My specs:

i7 - 3770, 3.40GHz (8 Clocks) ~ 3.9GHz.
MSI NVIDIA GeForce GTX 970, 4 GB
16 GB RAM (2x 8)
SSD 250GB (samsung)
HDD 1TB
2 Fan Collers on GPU
1 FAN on CPU
1 FAN IN FRONT OF PC
1 FAN ON BACK
2 FANS ON TOP
2 FANS ON LEFT
PSU 850 or something like this.

And all fans are on 100% speed. PC it's on HIGH PERFORMANCE, etc.

And i have Windows 7 Home Premium (i bought it)
Thanks..
 
Solution
Interesting as a pc shouldn’t shut down during normal overheat. It should throttle instead.

Thinking it might have nothing to do with cpu/gpu but instead be the psu overheating and shutting down. The fresh air is keeping it just cool enough. Still indicates a bad psu.
Aug 9, 2018
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I don't think so. I have only the games on HDD, and on SSD i have the windows./
 
Aug 9, 2018
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I found the problem. Temperature.
I remove the lateral aluminium cover from PC (box), and now it's pretty dam good. 60'C on both, (GPU/CPU), and no more shutdown or restart. Thank you!
 
Interesting as a pc shouldn’t shut down during normal overheat. It should throttle instead.

Thinking it might have nothing to do with cpu/gpu but instead be the psu overheating and shutting down. The fresh air is keeping it just cool enough. Still indicates a bad psu.
 
Solution