Why does my lenovo ideapad z510? Unexpectedly shut down?

I own a lenovo ideapad z510 and i'm running windows 7 ultimate 64bit.
When i run any tasks like browsing the web or watching movies everything is ok and good but when i start a game like tomb raider or apb reloaded it shuts down after nearly 30 mins from starting knowing that this problem recently occurred the computer was working so good. The screen just go black as i remove the power aource

I would say either a display driver failure, but it sounds like an overheating issue to me.

I own a Lenovo Ideapad B490, my best friend owns a Lenovo Ideapad Z580 and I recently helped a colleague pick an Ideapad Z510… My friend's Z580 was having the same problem as you… It turned out to be both a display driver issue as well as a heating issue… Take it to Lenovo customer care and ask them about it… In my friend's case, the HDD was running too damn hot and needed to be replaced (he had backed up all his data)… Since it was in warranty, they did it for free and also reinstalled Windows 7 Home Premium 64-bit which came with the laptop when he first bought it…
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PS:
1. Update the display drivers…
2. And get a damn cooling pad to use while gaming on it…