@AngusMcleod thanks
Do you know where I would find a diagram that shows how they should be seated?
Okay, so I bought a new GShield and here’s what happened:
At first, when I switched the power on, the spindle powered up.
“Weird” I thought, “but maybe it’s because I haven’t hooked up the spindle control yet”. So regardless I went through the setup on Easel…and it worked!! For a brief moment I could jog it in both directions. I was happy indeed. Problem solved, even though my spindle was acting funny.
Then I hooked up the spindle control and re-seated everything. This time, no spindle noise. However, when I went to the Easel setup, I was getting exactly the same issue as before.
So in other words, the new GShield has made no difference. Although it did for one try. Weird again.
Absolutely.
Could you try:
Dismount one stepper and connect it as the only one, without any spindle or anything.
Install UGS (Universal Gcode Sender)
Try jogging all axes with UGS, one at the time, connecting the one motor the axis to be tested. Put a piece of tape on the motor shaft to properly see direction of rotation.
Taking a step backward, and test one and one axis with no other peripherals would be my best guess at this time.
It looks to me like you have the connector pins for the homing switches and PWM spindle control soldered into the wrong location. Should be on D8 - D13, Gnd and Aref.
D9 = X homing
D10 = Y homing
D11 = spindle PWM
D12 = Z homing
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You are right @LarryM !!!
And you’ve actually solved it. As soon as I disconnect PWM spindle control, everything works fine!
Wow.
PS - I didn’t solder this on 
If you got it from Inventables that way, send them a note at customer support so they can check out their inventory.
SOLUTION:
SOLUTION: