Chosen Solution
Hey guys! I just pulled the HDMI cord out of my mac and then a 1/2” of the left side screen running vertically is blacked out. in the bottom of the screen 5 white lines are running horisontal. Besides that it looks like the screen has been pressed and broken in the bottom left corner. All this appeared just by removing the HDMI Cord. Do you guys have any ideas to why this is? Hoping someone has an answer for me out there! Thanks!
My screen was flashing and split in 2. I thought it was broken. I reset the pram. I also reset the smc. no data is lost. reset pram: hold Command + Option + P +R + power button for 15 seconds reset smc: hold Shift + Control + Option + power button for 15 seconds two times. Try that. it won’t damage anything.