Screen shutting completely off when playing games

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Dele43SraD

I have a Dell Precision M6400 laptop, 4 gb of ram, 512mb nvidia graphics card, and running windows 7

Whenever I play Dota 2, Archeage, or Hearthstone (have not tested on other games) my screen goes black instantly after about a usual hour of gameplay, sometimes it happens in 15 minutes, sometimes 3 hours, but it will just shut completely off. This has only started to happen recently, my GPU stays around 50-70 Celsius while gaming, and I have cleaned my computer of all dust. I can watch YouTube and other things and the screen will not turn off. Whenever it goes black, I have to restart my computer completely.

I have tested hooking up external monitors and it will display "no signal" if my display goes black and I do not know what is wrong anymore, help would be appreciated
 
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