[ozlo]

I too had the same exact issues. After re-seating and taping down the ribbon cables multiple times, the keyboard finally quit altogether. Furthermore, the sensor which detects if the keyboard is open or closed is now broken too! Whenever I turn the screen on, it thinks it is in landscape mode, which is not compatible with all apps. In order to switch to portrait, I have to go into phone mode/app. It will then reset again to landscape whenever the screen turns off.
I don't really care about replacing the keyboard since it will end up failing again, as they all do. I can still use the onscreen keyboard. Does anyone know of an application that would force it to stay in portrait mode unless I specifically switch it to landscape?