I have a question. I just got me a FW and am so excited. She is a beauty with very little wear. When I received her the motor purrs, the needle goes up and down but it didn't sew. I changed the needle messed with the bobbin and she sewed like a champ until I ran out of bobbin thread. After I filled the bobbin she is doing the same thing. Help! I really want to play with my new toy. Any thoughts or suggestions?