I've been frustrated by same thing last few days... *JUST FIGURED OUT A NEW SOLUTION !* that works for me...
Resolution changes DID NOT WORK
No IR device, that wasn't a problem
So, I happened to notice that my keyboard was disabled because I've been using my 360pc controller... When that is on, it completely disabled the keyboard... Check to see if that's the case for you (may include other gamepads).
I simply went into settings and disabled the controller, then the keyboard worked, then the console worked.
Hope this helps a few of you !