Learning to sew: Help! My Bernina is jammed! What to do?

Well, friends, I think that says it all. Sigh. I sat down to practice my darts and to baste my dress, like the good little student I am. But my trusty Bernina Record 930 needle moved up and down, up and down, but not forward and back. What should I do? Any advice? Puhleeeze! Hep! Hep me!