Sounds like the game doesn't recognize all score reels are on "0." You need to check the 3 switches on each score reel in the head. You should be able to see all 3 switches with a good flashlight, without touching anything. They should all be open at 0. On Aztec, you'll have a total of 16 score reels to check, and remember, you have several reels to compare to. Once you find the switch that is wrongfully closed, opening it will have the machine recognize the ball in the out-hole and will serve it to the shooting lane. The score motor will then finally come to rest.