I have a Galil card 18x2, ICM 2900, and three Gecko g201's driven by Mach3. 

The x axis, y axis, homing limits on x and y axis, and estop are working beautifully. 

Now, I am working on the z axis and I am totally stumped. I cannot seem to get the motor to move physically, on the screen, or using plain old g code.

1. I enabled the z axis in ports and pins, step pin to 6, direction to 7
2. I played with settings of dir low active and step low active and it made no difference - no movement
3. I am using a motor and driver that worked great on the x axis which eliminates the motor and driver as potential culprits
4. confirmed that the stepper jumper was on the galil card dmc-1832

and still no physical movement on the x axis or numerical movement on the screen

What am I missing?  My guess is that it is something simple but  I have run out of things to test.

Figured it out.

Within Mach3:

Goto Config - plugin control - double click the config button next to the @galil barker .... part
click on axis setup
Select z(c)

bingo the axis is active