I have completed the assembly of the CNC but for some reason when I connect to Repetier my stepper motors only go forwards. When I try to go backwards there is a high pitched noise and the Stepper Driver associated with the axis I am moving start to heat up. At this point, I just unplug the power since I do not think this is a good thing to have. I have attached pictures of how I set up the Ramps and how each connection with the wiring kit is done.
Does anyone know why this is happening?