Start by NOT cleaning every contact in the game. (oops, guess it's too late for that.) Seriously, best to track down and fix specific issues in an EM. Cleaning all the contacts means you're far more likely to mess up something that was working fine.

So the score reels all reset to 0 and the ball kicks out, but nothing scores points? Do the flippers work? Pop bumpers? Do standups light when you hit them?