Curved line under screen
There is a curved line under the screen. When I touch the screen it does not feel cracked. It goes away when I turn the computer off. What’s the problem and how do I fix it. Thanks!
Retired Mac repair person – doesn't mean I know everything, but that I've done a whole lot of repairs and have seen things.
Your display has layers, the glass being only the part closest to you. There's an interesting teardown of the retina display here on iFixit, and if you want to geek out, you are welcome to read it. My point is that things can happen other than cracked glass. If your computer were on my bench, I would:
Because that line is semi-circular, I will take a wild guess that someone sat on your Mac and – realizing their mistake – jumped up before it showed any obvious dent in the case. This would flex one or more of the inner layers and create a butt-shaped "wrinkle" in the display. However, I would also not be surprised if a small wire had come loose and was hanging down instead. If I were to place a bet, though, it would be on the Butt Damage option. It would mess up the display without necessarily causing a crack in the glass. And it would disappear when the computer is off (but see option #3, above).
In any case, if this is showing in all apps and Finder, you are looking at a physical issue which will likely involve replacing the display. Taking those displays apart is a royal pain in the part of the body I think sat on your computer, and such "repairs" often end badly.
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