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I am using a Macbook Pro (the 2015 model A 1398).

Just overnight my screen shows strange horizontal lines as this:

enter image description here

These horizontal lines are roughly gathered in the same place on the screen (on the top), and they may increase or decrease the numbers, from time to time.

However, if I do the print screenshot, I do not see any such horizontal lines. enter image description here

I did not hit or hurt my Macbook Pro recently. Can someone give any advice on how to fix it? I had restarted, shut down and restart a few times, but the problem still persists.

Info: enter image description here

Thanks experts for the help!

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    There's dozens of questions and answers on this site about horizontal lines on retina screens. Have you searched for them and tried the solutions that worked for other people? – fsb Mar 19 '18 at 18:43
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    I had tried this one -- but it does not work. "Command (⌘), Option, P, and R" seems not work for me... – wonderich Mar 19 '18 at 19:18
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    In my experience this is a sign of the graphics card failing. Can you find out the temperature of the graphics card using a 3rd party app? – Unassuming Guy Mar 19 '18 at 19:28
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    p.s. I tried this one and it does not work. apple.stackexchange.com/questions/98569/… – wonderich Mar 19 '18 at 19:48
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    I also tried to connect to another LCD projector (like giving a seminar talk), then the screen output for LCD projector has no those lines – wonderich Mar 19 '18 at 19:48
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Since you have a 2015 MacBook Pro that uses Integrated Graphics (the Intel Iris Pro chipset), you can be assured that what is manifested on one screen, will manifest on all.

What this means is that the lines you are seeing on the screen are not due to failing GPU but rather the LCD itself. You confirmed this by plugging your MBP into an alternate display device (projector).

If you have this under Apple Care, you should take it in to have it repaired straight away. To fix this, you will need to replace the entire Display Assembly and unfortunately, they are very expensive (approx. $850USD).

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