Black Frozen Screen | Pre-Loading Screen -After Champion Select (macbook pro)

After no update nor any changes, I have been encountering a black frozen screen (unable to alt+tab nor leave) before the loading starts. I have tried changing DNS, and firewall adjustments with no luck. anyone having the same issues. cannot play any game, not even custom ones. I am always stuck on that screen and i need to force quit to leave. thats when i am asked to reconnect...same result :| oh..before all this, the 1st game today, i was able to load to 9% of the game before it crashed for some reason, and bug splash popped up. reported the bug and tried to login back again. since then, the black screen has been halting me on every single trial.