Early 2011 model, A1278 / 2.3 GHz i5 or 2.7 GHz i7 processor.

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Screen flickering just on the middle of screen

My screen is flickering but I still can see the top and bottom areas of the screen so the affected part is the 80% in between (see Picture @ https://flic.kr/p/FVgq8w )

Apple MacBook Pro MC724LL/A 13.3-Inch Laptop

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It appears the image is breaking down in the middle. Is this happening all of the time?

What does the external display look like? Is it showing the same condition?

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The normal reason I see a display like this, is if the computer has been dropped and the video cable has jarred loose at the motherboard or underneath the LCD screen.

First step would be following the teardown guide to open up the bottom of the machine and reseat your video connector. Make sure you disconnect the battery before you mess with the cable to keep from having other problems and make sure you pull the cable straight out and not upwards . After you have reseated the cable, reconnect the battery and boot up and see how it looks. Also I am imagine you get the same screen at Bootup. If it looks good at boot up but fails after the system loads, that is most likely your video processor.

I have seen recently a LCD screen after being dropped having the problem also without it being the cable. On that one we had to replace the LCD screen itself. Takes a little time but is fairly straightforward if you follow the guides.

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Plug it into external monitor to eliminate graphic card issues.

If the problem is not on the external I would check the LCD connector to make sure it is still connected fully.

If that does fix it you should make sure the lcd connector on the board looks ok, if it does you most likely have a bad LCD.

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How do you reconnect the LCD monitor. I think mine came unplugged when it dropped on floor

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