PC keeps crashing/rebooting while gaming.

Hi, so since a few weeks, I have big issues with my PC.Every first time I start to play the new Modern Warfare 2 I get a black screen, my GPU fans run loud and then I have to press the reset button, to reboot my system. Afterwards, it's running fine, until I reboot my PC or turn it off over night.I encountered a similar issue two times. Once while playing Victoria 3 & once while playing an Indie Horror Title made in Unity. However I did not need to press the reset button manualy, because my PC rebooted on it's own and it was also fine afterwards for the evening without further crashes.Sinc

 

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very nice!