I was taking a closer look at the piece (has "C022032" on it), and there's enough metal to complete the path of the circuit. Could the pads be in continuous contact? Here's a specific example:
I put Space Invaders in, turn on the power. The red LED light comes on, and the graphics start. With the joystick I can move the tank to the left or right, but the red button doesn't fire at the aliens nor do their bombs do any damage (like a screensaver). So, I push the reset button and nothing happens at all. Same with the Select button (though I dunno if anything should happen). What do you guru's think?
When I opened the system, this piece (the plastic "ribbon") slid easily out of the black housing that it connects to. I assume that's what's supposed to happen so you don't rib the ribbon when the system is opened up.