Hi all, recently received Zylotex 4th axis 269 in/oz stepper for my Taig minimill. Plugged it in the drive, configured Mach3 accordingly, motor energizes, DRO updates correctly, but motor will not rotate. Operates fine in X,Y,Z ports, but not in A axis port. Any ideas where I go from here? I've tried everything I can think of to no avail. Even tried it using old Mach2 but no joy. Thanks.