Shouldn't need to enable the drive moray nothing special needs to be done. If everything is correct it should enable on power up and lock motors. When working and if not tuned the motors will make an hissing sound.
When using the Current loop thru software or Flicking dipSw #4 the motor will buzz for sec then stop hissing.

I'd be very surprised if you have Dead drive because I've fitted loads of these and AM drives never had faulty one yet so check your wiring.