Hello Robinna,
Just a coincidence that machine stopped working after filling the bobbin, providing you have the needle in the correct way round the chances are the machine has gone out of time, I can attach timing instructions if you email me and remind me of your problem, this site no longer allows email addresses to be shown so type in my email address below as you say it not as you read it.
Ken
drivewithken at blueyonder dot co dot uk
June 2009