Hello Krystal,
Sounds like your machine could do with a drop of oil, get some fine oil such as WD40, I don't have a picture of your model but if the top comes off the machine oil all moving parts and move the zig zag lever back and forth rapidly, if you can take the top off the machine have a good look to make sure nothing is broken near the zig zag mechanism, if the machine body is one piece then you should have oil holes in the top of the machine, don'tb flood the machine with oil, give each hole a squirt and then try the machine, unlikely anything is broken probably gone completely dry, let me know if you have any problems, e-mail me.
Ken
drivewithken@blueyonder.co,uk, September 2007