Chytayzie, how wonderful to receive two machines for Christmas. Sounds like a win-win situation for you and your daughters and grand-daughters.
Found out with internet research, DH had the bobbin rewind on with the 550 Bernina buzzing in protest. Turned it off, and the machine was fixed! Made both of us happy again. I have an Embroidery machine and Serger, all Bernina products because they seem like a good work ole horse. Happy sewing on your choice of sewing machines.