Comments from a novice who in the last couple of weeks has learnt not to trust what you see with regard to wiring etc. I agree with Boyan that checking continuity with a multimeter is a must. In my case my stepper motor wires are colour coded red/green/yellow/blue. I found that the wires in the plugs that go into the back of the control box do not follow the colour code. i.e. the blue wire in the plug that connects to the stepper motor ends up as the yellow wire in the plug that goes onto the circuit board.?
Not uncommon apparently to have poorly crimped connections.I had a wire fall out of a plug.
I also had issues inputting the correct parameters into "settings" / "axes 2" To be fair the vendor did mail me with some figures.
Don't know if that helps but it's a very steep learning curve!!

Bob S.