blinking screen when I play league

I have my TV hooked up to my laptop and anytime I try to play league it flashes black over and over and over again. I was in a custom game and I was messing around with it to see if it was the cable or not (It's not) and I got booted for being inactive and as soon as I closed out of the game it stopped blinking. It's been blinking over and over so much that i can't even play league now.
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