stepper motor problem!!! (no replies)

hi every1 ! i was driving a stepper motor ....few days ago the motor was in working condition although there were vibrations in it but it was in working condition....but today when i checked it it is not even rotating on the same program....i have checked properly the internal wires ..all is fine .Then i checked stepper motor through battery method i hope u know the battery method that is just give ground to common and 1 by 1 give 5v to all the wires of motor ..it will take jerk and step....so when i checked this today i was very surprised to observe that at 1 time only 2 wires is taking jerk and step....that two wires are not fixed when i checked it several times the wires which were taking jerk were different.

i dont know what is happened and i am very worried about this problem.what does it mean ?plz help me out.