Frage Z Axis not spinning, motor whirring.

Hello,
Sorry to bother everyone but my machine is refusing to move the Z axis. The motor is whirring and if I take it apart it spins fine, but as soon as I put everything together it jams.
When I use the SC program to manually look at it, it spins fine but only in one direction, whether I press + or -.
Ditto, when i adjust the jog feed to 10 it just refuses to move at all.
Any help appreciated.
SC 300/2

I think you have a bad motor.

check the connection on the main board no wire damage all correct connected?
You can try to change temporary the motor to check if it is no software issue.

last contact stepcraft or your vendor

good luck