As for the Z-axis leading to system reset:
Be sure you:
1. Are using a proxmity sensor. (I found that the one that htey provided is cheap, mine broken within 22 hours of use)
2. Have loaded a firmwear that references the proximity sensor
3. Are using the proxmity sensor wiring to your Z endstop.
I did have the same problem, and it appears that the code on that board initially sets the Z axis to be a reset switch (for some strange reason).
Be sure you:
1. Are using a proxmity sensor. (I found that the one that htey provided is cheap, mine broken within 22 hours of use)
2. Have loaded a firmwear that references the proximity sensor
3. Are using the proxmity sensor wiring to your Z endstop.
I did have the same problem, and it appears that the code on that board initially sets the Z axis to be a reset switch (for some strange reason).