Black bar down the middle of mac screen. Help!

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Dec 29, 2015
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Hey, I have been having some troubles lately with with my

MacBook Pro (15-inch, Early 2011)

This has been a black bar directly in the middle about 2 inches every time I play a game. This is not happening when I am web browsing just when i'm playing games like Gary's mod on steam. I'm having trouble explaining this but the black bar makes the left side of my screen go to the right and the right side of my screen to the left. I can't move my cursor through the black bar in the middle but i have to drag my mouse off the screen to get to the other side. Its like the badly text drawn image below this. PLEASE help me this started happening recently and no its not the game I am playing since this has happened on multiple games off steam as well.

-----lll----- < I would have to drag the mouse off the screen this way to get to the other side since the black bar does allow
-----lll----- me to go through it
-----lll-----
-----lll-----
-----lll-----
 

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