I got the same problem after replacing my Kindle screen.
It's my second replacement screen, but from a different seller than the first one which worked perfectly.
The only difference I noticed is that the new screen lacks the Serial ROM on the Flex-PCB connector, while the original and the first replacement screens had one.
Does nobody have an idea what this could be caused by?
Someone on instructables is also having this issue:
http://www.instructables.com/id/Fix-...yboard-Screen/
See first comment by mousegan (including picture)