Quoted from SantaEatsCheese:Make sure there are balls in the trough if you just moved it. Some older machines (my Data East Torpedo Alley and Black Knight) would act dead without balls in the trough on boot up. Won't even let you try to start a game.
Wasted about 4 hours figuring that out once.
Good luck!
Underrated advice. Did the same thing with my Firepower. Wasted so much time figuring out why it wouldn’t start, even though it booted.
OP, check your ball trough switches too. Make sure you have both the proper amount of balls in the game, and that those balls are activating all the trough switches properly.