So I’m writing on this forum because my MacBook Pro late 2011 15in would go through the white Apple loading screen and then as soon as it would go to the log in it would go black. Keyboard lights up. Screen works fine in safe mode and when it’s plugged into an external display. I called Apple and did everything they said. Did a diagnostic and got no error codes. I was messing around in system preferences and went to energy saver and unchecked the 2 boxes and then my MacBook worked fine. I think it has to do with my battery cycle being so high. But anyways unchecking those boxes seem to have fixed my macbook