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I took off a lot of stuff to replace the screen. I thought I was very careful taking pic and making sure to keep thing s together… What did I miss? What controls the arrow inside the computer?? I want totake it all off and start over but there my be an easy answer? PLZ HELP

Check that the trackpad control cable is properly seated on both sides. Here’s a link to the needed guide which you can follow to locate that cable and the trackpad which must also check out.