Make sure the propellers haven't been squished against the body of the drone. I've seen that happen. It's easy to reach in there, bend them up a little bit, and then they should spin. The 4 motors for each drone are wired in series in the circuit board, so if one spins, they all should. If none spin, but the lights still flash, you may have a broken wire internally on one of the motors or in the connection between the motor and the circuit board.

It IS the same cable that runs the lights and propellers.

Cheers,

- Dude who designed the circuitry for that game

Not 100% sure every time the drones turn on in game, but the coil test feature definitely makes the props spin and lights blink.

Yup, you can pull the props off.