Client giving black screen

I just started the game almost 3 days ago and I've found that the client will not load at all or make my screen completely black with no option to leave or other apps forcing me to shut down my computer this is the second time I've had problems with the client. However this seems to only happen when i attempt to play warrick it hasn't happened with any other champion. I'm not sure if his the problem or not but do wish to be able to play him. The second problem i had was with a reconnecting screen that lasted and hour and ten minutes before i decide that was enough. I do wish this problem could be solved soon i do enjoy playing the game.