I HATE those machines. Here's what you (unfortunately) have to do.
Remove the boardset from the game. Find someplace where you won't be distrubed for a while. Then, disassemble the whole thing. Keep track of your screws.
Reseat any socketed chips. You don't have to remove them completely, just a little bit and then push them back in.
Reassemble the same way you took it apart. Make sure all your connections are good and snug.
While you're at it, vacuum out where the boardset goes. I bet it's full of dirt. Do this /before/ you put the board back in.

Replace the board and fire it up.
Hopefully that fixes your problem. These sets are so problematic, especially after a more. Too many connections.