When you look closely at those ribbon cables its hard to imagine them getting loose! They are tucked in pretty good. My pro 2055 was an old radio I got off Ebay cheep so I didnt worry about doing a home repair on it, and luckily it worked. But I'd be afraid to mess with one of my newer radios though.
How do you do the master reset?I had that happen once on my 996T (which is still on the desk beside me). I performed a master reset and it was back to normal. I don't know what happened and never happened again (knocking on the wood of my desk). Thought I would mention it before you start taking the covers apart. I hope it is just as simple for you.