Black Screen after Champ Select

I FIXED IT!!!! I FOUND THAT YOU PRESS SPACE+ENTER+DELETE AT SAME TIME ABOUT 4-5 TIMES AND IT SHOULD WORK!!!!! READ THE BOTTOM TO UNDERSTAND WHAT MY PROBLEM WAS. This only happened recently but, when I tried to join two games it worked perfectly fine. After we chose our champions and started to load in the game, my screen turned black and I couldn't load in. I have a mac and I've seen others report this but, my account got a 20 min leaver buster for a reason I couldn't solve. Riot could you please try to deduct the buster off my account and if anyone knows how to fix this just leave a comment. This also happened to my PBE account to.