Stepper motors are not working

Hey guys,

I have a problem. I bought two steppershttp://dlnmh9ip6v2uc.cloudfront.net/datasheets/Robotics/57BYGH420.PDF and two big easy driver Big Easy Driver stepper motor driver to make them work. I connected them as it is shown in the website, but when I tried to make them go they didn't work. They make like strange noise and vibrate but don't actually move. I use a 500 power supply which gives 25A d.c. Where is the mistake?

Thanks

Most like you wired them incorrectly. A picture of the wiring, or barring that a verbal description of what color wire is connected to what pin would help identify your problem,