You'll need to see why the start button isn't working. Check to make sure there are credits on the game. Also, check the coin switches to make sure they are not stuck in the closed position... You can check to see if there is power at the start switch with a multimeter - set at AC 200 volt. If there is no power at the start button, clean the contacts on the reset relay and the score motor at the index stack/A position... If this doesn't work, we'll have to look at other switches in the start circuit...