Since it was bumped...
Typically, you can unplug the box from the back of the set; from there, the INPUT and such buttons are no longer disabled.
Since that also frequently disables the in-room remote control, you can take it one step further by getting a universal and programming it to that television. Easy if you tend to stay at the same chain - I run into a lot of LGs, for instance - but you'll want to bring along a code reference if you're seeing multiple vendors' televisions.