Screen flikkering in game

When i was in 1rst game after a short LoL- Update, after 5 mins in game i got Black screen (sound effects work correctly) i had no option to turn off LoL only to force shut down the computer, then after restart and logged in to catch my game again, the whole screen is flikkering, (scoreboards, skills, like burning graphics card, ( i test many other games and thx god is still healthy,) i saw the same problem on boards so i will report it again for someone in RIOT to notice it. Bad Santa, Really Bad,
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