PC restarting during a game and don't boot up

My problem is that my pc is restarting when i play a game that sometimes has high graphics..
After it restarts all fans and leds go on but the screen remains black..
When i turn it off and on manually a few times the screen stay black and doesnt boot
After a couple of minutes it works when i press the power button.

I did some tests for the GPU and didnt restart.

I have this pc for 1 year now .. and in the last 2 months appears to do this thingy.
 
sounds like an overheating problem... which graphics card are you using and are you overclocking? did you recently install new graphics drivers?

it may be helpful to also post your complete system specs including operating system and processor type.
 
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