I just had the same problem. I did everything. powered off and on and that did not work. but then I hit the power button for the screen to go off, not power off, and then I hit it again and when the screen came on the keyboard started working. Not sure if this is the FIX, but it worked for me. In future if it happens again, I will do the same process and see if that is the acutaul FIX... Good luck