Mine didn't work either, and like lots of you (probably) I tried almost everything and I read a lot (and when I say a lot I mean A LOT) of comments from this website site and nothing worked! Finally I found this one talking about a half lit battery or something like that but I didn't understand it!! I looked for it but I couldn't find anything so I went into setting one last time to see if I could find anything and I saw a half coloured battery and I clicked on it! It took me to the battery screen on how much battery you have and stuff like that! I had my battery saver on, so I turned it off and BAM!!! I was able to use my keyboard again!! YAY!! So if this helps you that's FANTASTIC and if not then I'm super duper SORRY and I hope you can get it fixed (soon)!!