Hi,
on your Inputs page you have all limit switches and home switches assigned to one input, and even worse you have chosen pin 3.
Pin 3 is NOT an input, its an output, in fact its an output for the y axis according to your Motor page.
Also you have in your Home and Limits page specified that Z is to Home but you have not enabled the Z axis motor in your
Motor page.
Try this suggestion: wire your three home switches individually and assign each to one input. I would not bother with limits until
you understand homing. You have tried to combine all limits and homes into one input, you are not the first and wont be the last.
If that one input activates Mach does not know whether the X axis is about ready to sail off the end or whether the Z axis home switch has triggered.
Try:
Estop pin10
XHome pin11
YHome pin12
ZHome pin13
Disable X+,X-,Y+,Y-,Z+,Z-
Craig