The video won't play for me. That said, is the score motor rotating? If not, is the service plug for it unplugged or in the "off" position? Are wires connected to both tabs on the motor coil winding?
Can you slightly rotate it with power on (Game over does not matter); does the motor continue by itself for a bit and then stop? If not, troubleshoot and figure out why. Standard electrical troubleshooting techniques apply here.