My computer shutdown after install windows 10

Hello guys
After upgrade my windows 7 to windows 10 my pc shutdown suddenly but the light and the fan is still working... And get in the monitor "No Signal"!!!!
The problem appears most often when I playing games like Bf4.
I tried to playing in windows 7 but I didn't get it !!
so can you advise me what to do?

Did you check to see if the monitor is properly connected?

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