Can anyone help? ;_;

Alright so here's the thing, I just came back from a little league-break, decided I'd do my placements now. Thing is; I queue up, get into champ select, no problems, everything going just fine. I get to the part where I'm supposed to be in the loading screen, but instead I get a blackscreen for a few seconds before league tells me it's crashed. This happens with every gamemode I select, tried repairing the game and reinstalling but neither worked :( Any ideas what might cause this? Cheers and thanks in advance!
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