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My computer screen has a huge thick black vertical line down it. it has a few coloured lines next to it then a smaller black vertical line. I took a screenshot and everything was fine. How do I fix it myself???

See the below guide for the MacBook Pro 13" late 2012 (Retina). You will need to order a full screen assembly for the A1425 to do this. MacBook Pro 13" Retina Display Late 2012 Display Assembly Replacement