How To Do If Axis Does Not Go Back To Mechanical Origin?

What can we do if cnc router does not go back to mechanical origin?
Solutions are

1. If value is changing on software screen, but the machine does not move, please confirm that A. if machine is power on, B. confirm if controlling wire connected well, C, confirm driving motor make alarm, D. Check if 12V or 24V switch power supply is broken.

2.If value does not change on cnc router software screen, please A. confirm control board is compatible with control software, B. check if control board plug very well,C, Plug to anther slot to see.
The above solutions usually can solve the problem of cnc wood router does not go back to mechanical origin.