Hey, everyone! New here! My friend and I are building a 1515 CNC Router and we are having some problems. So we got everything wired up & the interface works great, however out stepper motors are unresponsive. The steppers have power and are locking, but they don't move and make a popping sound when you try to get them to move. So if anyone knows the answer, or has had some experience with this, help would be greatly appreciated. Thank you for your time!