Hi David not too sure but sounds like you may have thread jammed in the spool.
Try taking the spool out of the compartment and check for loose threads and fluff these can stop the needle moving.
It could also be on the wheel at the side there is a bit you turn so that the needle doesn't bob up and down when filling the spool maybe that needs tightning.
Hope one of these works for you.
Lynn
lynn
March 2007