I have a Toshiba Ultrabook U945 S4110 and the fan was making a horrible noise, so I followed a youtube video to take it apart and clean the fan. When I reassembled and restarted, the fan problem was solved, but the keyboard does not work. I looked at "keyboard" in the control panel and it said it was connected and functioning properly, but there is still no response when trying to use the keyboard. I hooked up a USB keyboard and that worked great, as does the mouse, etc., except it does not show the wireless anymore. I'm thinking that as to do with the nonresponsiveness of the wireless button that is on the keyboard. I'm stumped and obviously, made a bad situation even worse. Any solutions out there? Thank you!