help! EOS 80D menu, info [etc] buttons will not function

[photos4fun]

I have an EOS 80D that will 'take a picture' and flash [I have tried all of the dial options, from Manual to auto]. The problem is I cannot get any of the Menu, info or other function buttons to work. I am unable to view the photos being taken. 
This happened after a road trip home from vacation. The camera was in the case, but may have been left on? I tried the 'manual reset' by removing the card and battery and holding down the shutter button for 10 secs...no luck.

Any info/help is much appreciated.

Thanks!

[Tronhard]

Hi and welcome to the forum:

At the risk of asking a silly question, have you tried tapping the INFO button a couple of times?  One of the modes for that is a black screen.