After tabbing back into league loading screen or just in game I have a black screen, I can't tab out of it to close it or just close it overall with alt+F4 and I hear the audio of the game normally...
its a graphics glitch that's been around for a long time if the computers graphics card isn't processing it fast enough due to multiple programs or tabbing in and out the screen will appear black and freeze the graphics but sound is separate so is still present.
normal fixes are upgrading graphics card updating it or just taking care of other stuff before or after games.
