Feed motor bad?

I've had my M200 for about 3 months and when I went to begin a print the feed motor gear just jiggles back and forth without revolving?  Anyone had this happen?  Is my motor bad?  I verified that the set screw was tight.  When not attempting to load gear doesn't move at all.

This error most probably results from a broken ribbon cable!

I will happily buy your lunch.  I inspected the connections and sure enough my green wire had come loose from the connector to the motor.  I soldered it back and ran continuity tests, reassembled and am back printing.  THANK YOU!