Assuming it was just a loose wire behind the deck itself, I pulled it out earlier tonight to repair the wire. But the wires were all ok. I fiddled with it some more, and it looked like something was loose internally. So, I took it out, and brought it upstairs.
Not having done this before, I wasn't sure where to look - but had an idea that if something is loose... it should be relatively evident. Well, I had to take the entire thing apart. Even removing the CD player from inside. All to see the bottom of the circuit board, where I suspected the problem was.
That's pretty much what it looked like mostly taken apart. The culprit? As I suspected, there were some solder connections on the main board that have broken over time:
Now that I could tell what the problem was... the only thing to do was solder it all back together. Thank goodness for magnifying glasses and 30 year-old soldering irons. That Cold Heat soldering gun would have been fantastic.
But, I hacked the thing back together. It's ugly, but - it works! :D Who'd have thought being a bit geeky would pay you back financially?? If not for my "geek discount", I'd have to go and buy a whole new deck!