Antwoord op "Horizontal lines on top and bottom screen"Having the same issue with my MB13, 2017 for the last three monthly. White horizontal lines close to the menu bar on top of the scree. I doesn’t happen every time, but mostly once in two weeks or so. Overtime, I realized that it happens when I use it for something more demanding than average. For example, I was streaming the football game for over two hours and it started. And weirdly, if I take it close to an air conditioner, the lines start to disappear in front of my eyes in 2 mins or so. This has worked three times already. Lines appear, I go close to the air conditioner, turn it down to 18 degree Celsius and it disappears. This is bugging me a lot since for the last three months, I cannot use the Macbook for anything more than web browsing, some powerpoint, and occasional photoshop. I am out of warranty and I feel that it is gonna fry up anytime !!