Since there are audio problems as well - could it be that when the game goes to play that audio file when a coin is inserted (in attract mode) which might be corrumpt (or whatever) and causes the game to lock up? Physically, and electrically the switch is fine, but the sequence of events during coin up in attract mode is what seems to be messing up.
I'd bet on a ribbon cable plugged incorrectly, or the Roms on the sound board needing reseating (check that all the roms have been inserted correctly and not bent/broken pins) if it was recently put back together?
West Chicago, IL
