The balls are not the problem. The hopper is full, and the lights at the top aren't flashing, just the ones around the reel and under the open slot. Also, the open slot is not opening and closing. It is just closed. I have played probably 400-500 balls through it, but nothing. Inside the open slot is where the E is. At first I thought it was a jackpot as well, but it wasn't backed up with payouts.