game won't load after champion select plz help

first i updated my game to the newest patch, then i realize i can't get in to draft pick, whenever i click play for draft pick or ranked, my game just turned to black screem. then i tried to repair the client and i it worked, but then i can't joined a game after champion select. i'm currently in a ranked game and i'm probablly gonna lose lp. after everyone locked in and game start, my computer won't show the loading page. when i click on client it said game still in process. so i log out and restart the game, it said i'm currentlly in a game and i click reconnect, it still didn't work. i repaired it again the same problem happened. plz help i've been afk for 2 game by this problem.