I also encountered the issue at the bottom of the screen. I can't get mine to go away. I can make it vary a bit or at least the whole display to vary by fluctuating the connection, but it just won't go away. I'm open to any other suggestions.
I might have manhandled the bottom of my screen a bit. I didn't realize how to get the plastic u-shaped cover off, and I fudged around with it for a while before reading somewhere that it just slides down. I thought I had read that it snapped on, so I had been a little flustered on why it wouldn't snap off.
Anyway, if anyone has suggestions I'd be all ears.