回复： Horizontal lines on top and bottom screenWell, strangely enough the lines on my macbook pro didn’t appear in the past few days, even with very heavy usage. The only thing different that I did that I can think of is that I built a new PC so the external monitor I used to plug to my macbook is now being used on the new machine. Thinking back, the problem may have first appeared when I started using an external monitor. I live in Brazil and the cost of a new display assembly is R$3500,00 (~1000USD) according to Apple. I chose not to have the screen replaced as I’m not fully confident this is a display problem.
回复： Horizontal lines on top and bottom screenRecorded my display misbehaving today: https://www.youtube.com/watch?v=p6FficHt... At least in my case, these lines only appear after a while (~30 min or more). If I shutdown the computer and turn it back on right after, lines will still be there. However, if I wait a couple minutes before turning it back on, they won’t be there. The angle of the display doesn’t matter at all. Leaving the macbook on for long periods of time does make the problem worse. In this case, lines get darker and sometimes appear at the bottom as well. Ventilation seems to be working just fine and I can hear the fans kicking in during intensive tasks. Today when the lines appeared I placed my macbook in front of an AC unit and the lines faded slowly, so the problem is most likely heat related.