A few problems I had with my clone of the Geeetech i3 Pro B. Not all were problems with the printer, some were things I connected wrong.
-Bad wiring connection at the plug for one of the stepper motors.
-Stop switch connected to wrong port on GT2560 ( min stop vs max stop)
-X and Y harnesses not interchangeable, caused x and y axis to move incorrectly.
- Belt tensions too tight, made the stepper motors bind up.
Overall, I would contact Geeetech. I bought a clone, and they have still answered questions for me. They should be able to get you going.