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Screen tearing on MacBook Pro 2012 15" retina. Worked completely fine until a week ago.. one day the screen was flickering a little and then this happens. What could it be? :
MacBook Pro Glitch/Restarting, Possible RAM Issue? | MacRumors Forums
SOLVED: My MacBook Pro screen flickers and glitches. (Images) - MacBook Pro 15" Retina Display Late 2013 - iFixit