The screen turns black by itself

Hi,
I'm from Brazil, so please disregard my bad english (I hope you understand );
Well, I've one Toshiba L645, and recently it screen turns black (do not turn off, just stop shine) when something heavy is running (NBA 2k13 for example), and i've no idea about what's happening, when I close it (the game) the screen shines again.
Please, can you help me, at least an idea about that.
Thank you.

The screen could be going black for several reasons. It could be that the Screen Saver is turning on and stopping the video. Check your Screen Saver settings and make sure that the Screen Saver is turned off. It could be a bad or intermittent video cable between the system board and the LCD screen, but I don't think so since the screen comes back when you turn off the game. How would an intermittent video cable know when the game was being ended? It wouldn't so it can't be the cable. It could be that the computer's Sleep or Hibernation mode is turning on and turning off the screen. Check the Sleep and Hibernation settings in Control Panel under the Power Options Advanced Settings. Make sure for the testing that they are both turned off.

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The screen turns black by itself

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