My screen turns black after chapion select.

Whenever a game begins, right after champ select my screen turns black, I've tried everything and the only way to get out of it is to manually shut down my computer. I've looked up solutions but none have worked for me, when i checked my Riot games folder there was NOTHING inside, same with my lol client, i even downloaded the game again but the problem will not stop. The next patch (5.13) should be tomorrow should that fix it? Please help.