Don't use the new client
So in series from silver to gold, win first 2 games. Q up for my 3rd and once I get into champ select, it's just a black screen. I hear the music, the people banning and picking champs. Eventually I get kicked from it and it's treated as a Q dodge. I restart the client and get back into the Q. After I accept it, again the same thing, just an all black screen with the sounds. I think it's perhaps my computer, so I restart it. Log back into League, get back into Q. Accept. And surprise, an all black screen. Perfect chance to move out of Silver, ruined by things outside of my control.
TLDR: Don't use the new client, it could quit on you at any time wasting whatever progress you've made.