Hello all, I am wondering if anyone else has this issue, and if so what they did too fix it. My 2013 MacBook Air 11" is absolutely amazing, and I am loving it. BUT i have an issue with it. Randomly horizontal lines will appear on the display. They are totally random and disappear as soon as something moves or changes on the screen. Here are pictures of the issue. The Air i bought was refurbished, and I went to the Apple store for it to get fixed. They replaced the CSD. But I soon noticed that the issue was not fixed. SO i contacted Apple once more, and then went to the store, where they replaced the main logic board. After a few days, I noticed the issue AGAIN. So i got in contact again and they said they'd give me a replacement computer, which they did. And believe it or not, the replacement model HAS THE SAME ISSUE!!!!!! This alarmed me greatly, and I have been in contact with Apple support to get the issue resolved, but they think its a software issue and want me to wipe my SSD and start fresh to see if the issue persists. However, since I took a screenshot and the line issue DIDNT show up, I assume that it is hardware related. Apple support wont seem to accept this evidence, though. And another thing, I am almost positive that I saw the line on the first Air on the ride home from the store, before I had any software installed; therefore it wouldn't be software. Maybe an OS issue? Or could it be an issue with the 2013 Airs that Apple wont admit to? Does anyone else have this issue? If so what did you do to get it resolved? At this point I think Apple should replace it with maybe one of these 2014 refresh models (because maybe such an issue would be fixed with a refresh of the Air) or maybe even replace it with a Pro. Thanks, JerTheGeek.