On champion select the screen goes completely black

come one seriouslly... just normally going on to a blind match and i in champion select the screen just turns black happened once im like aight cool with it then it gave me a 5min restraint i was ok with it until it happened again and now its a 15 min ban i dont want it to happen again just because of a bug please fix this... computer is Dell Inspiron 5548 everything was normal until today. It was working after this patch but the blank screen just happened today