I have some questions:
Were you using the USB cable before?
Are you using G201 drivers with stepper motors? You mention Servo motors, so either you are using steppers, or a different Gecko driver like G320.
If you ARE using G201s, do you have power connected to terminal 1 & 2? THESE wires should not be "daisy chained" from one drive to another, but each drive should have its own power wires from the power supply.
If your drives are "Daisy Chained," then for example:
The red or + wire will come from the power supply to the X axis drive and connect to terminal 2. A wire will run from THAT terminal 2 to the Y drive terminal 2. A wire will run from the Y terminal 2 to the Z terminal 2. Ditto for the ground side and terminal ones.
Did you change the grounding from one case to another? EG: Was the previous case isolated from the geckos--But the new case has them grounded to the new case?
The "Power" LED should be lit when the drive is powered up.