Whenever I hit Home and the Z limit closes, the sequence shuts down. I have to disconnect, physically move the z axis off the limit and reconnect. If I move the X to the limit, it shuts my PC off, assuming it is overloading the USB connection due to a short. I have the ground to the common and the red to the NO pin. On the blackbox, I have them in the ground and power pins for each axis. The blackbox is not seeing the limits. I dont know where I am screwing it up. Please help.