Two things - As mentioned, the replacement screen is a bit different. Mine had a screw where an empty hole should have been for the "captive screw".. a bit confusing at first. Just remove it and carry on.
Second, if you're an occasional nunce like me, you might be confused by the little tab/prong/raised guy next to the screw. After you've screwed the "captive screw" in, that thing should be hovering above it/the metal plate of the screen, and should look just like the removal picture.
FYI - If you forget to replace the little plate, your Lock button won't work. At least that was my experience.