Quote Originally Posted by CommanderKenyon View Post
I've just got a 6040 and having problems with x axis managed to get things moving in Mach 3 rest of axis are fine but x moves in random directions and sometimes don't move just make humming noise with no motor movement atall
It will be a loose connection to the Direction pin on the board or plug it's a common thing. That or the wire as break in it like MushT suggests as the wires are poor quality.