Original post by: Carl Schultz ,
Pushed the flat cable into the connector, then locked the tab. The second line of keys did not work. SO took the flat cable out, checked it and seemed to have all the lines, one end was bent, tried to put it back in, same problem. Ordered a top case/ keyboard/ trackpad and will put that on and be careful about the flat cable. I’ve done many of these, this time I forgot to move the lock piece up. Hope the new stuff will solved the problem.