Hi guys, I need some help. I am new to CNC and I am working on my first build, but I've run into a problem.

I have a rig controlled by a G540 with four 381 oz. Automation Technologies stepper motors connected to it. I had gotten everything connected and was getting movement on all axis'. My problem arose when I went to scale the axis' with Mach3. As the X-axis began it's first movement the machine locked up. Through individual axis testing, I came to realize that the Y and A-axis no longer worked. I found that switching the motors (Y to X and A to Z) yielded movement in those axis', but still nothing in the Y or A.

I sent the board to Gecko and it turns out there was "Customer induced damage". They said the damage is most likely from "shorting motor windings together, reverse polarity, or shorting the motor to GND on both axis". They are repairing the board and sending it back to me.

My question is, how could damage happen simultaneously on two separate axis'? Any thoughts on what the problem could be? I don't want to just plug everything back in, once the board arrives, so what is the best way to track down the problem?

Thank for your help!