Black screen

Hello guys, I have a problem.

In middle of my gameplay, monitor turns black and it shows in yellow square "Power save", something like that. My PC is still on and I can hear sound but I must restart it in order for it to work properly again. I forgot to mention that my fan starts to spin very fast and I can hear buzzing sound. It happens in all games I play, for example "Cabela's Dangerous hunts 2013" and in "Multi Theft Auto". My PC specs are in this topic:

Thank you very much!
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