Every so often the screen would flicker, black out and show only those
Hey, so I had the same issue on a Macbook pro (M1) where every so often the screen would flicker, black out and show only those exact vertical lines and so I took it in for repair (in warranty, otherwise repair is ~£500-£1000). It seems to have been a hardware issue as when I mirrored the display on a second screen, it worked but only on that screen (I advise you test this too so that you can point the repair person in the right direction as it's not a common issue, it seems). So the team at Apple replaced the screen and left it running for a few hours - it's been a few days and so far, no more blacking out and lines.
Just to note, the issue I had would sometimes "fix itself" and not show for hours, which is why I left the issue for 2 months before the issue finally became more of a permanent thing. However, first time I sent it to Apple for repairs, they only checked it for a few minutes, couldn't replicate the issue, then sent it back untouched.
Is this a good question?
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I just took my Macbook Pro to the Genius Bar for the same (or very similar) problem. My screen blacked out, then showed vertical dashed line right through the center. I restarted a few times and it would flicker on for a bit appearing to load with the line still there, briefly flash the log-in screen, then black out again.
When I took it in, the specialist immediately diagnosed the issue. It was indeed a bad display, but in my case, caused by a tiny adhesive privacy window I'd affixed to cover the webcam. You can't really tell because they're so small, but these prevent your laptop from closing completely and creates tension that ultimately causes damage like that Dan describes above.
The Apple Store doesn't sell privacy windows and this is part of the reason. Apparently it's relatively common. If you want to keep your camera covered, a post-it or a colored piece of tape is probably your best move.
by Elissa Besta-McNish