So I Have An (Mac On Title) And I Was Installing Linux On It When Suddenly Linux Froze Just To Check I Disconnected The Charger The Brightness went down which is a normal thing on Ubuntu But Nothing Seemed Responsive So I Forced-Shutdown The Computer And Well When I Booted Back The Screen Was Black I'm Guessing Is The Brightness But The Brightness Key Seems To Do Nothing Also The Keyboard Brightness button also does nothing