My mac book pro's screen shuts off a lot

My Macbook pro's screen is shutting off whenever i open some games i downloaded off the internet or try and play any game on my browser. It didn't use to do this only recently because it is winter and my room gets rather cold causing my mac to get cold which i think may be part of the problem. I know its only the screen that is shutting off because the lights underneath the keys are still lit up, and i have to hold the power button to restart it. Thanks in advance.

1. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own"
2.Reset PRAM. http://support.apple.com/kb/PH4405
3.  http://support.apple.com/kb/PH10930
Best.

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