I am test benching: microsteps at 400/rev (0.9 degrees),nothing connected to the motor.
power supply can either be 5V near the Estop, or USB.
Just tried with 5V... now I am getting confused. With the 5V-non-USB, the stepper does not work, but the very small led next to the X connector block still blinks a bit.
Now I went back to USB powering, I get the same -no stepper, small led blinking.... restarted Mach3... same, now the stepper does not even stutters...