Use the handwheel and see if the feed dogs move. If they don't the first thing I would check is the up/down switch.
I have a 2170 and there are 2 switches on mine. One by the bobbin and the other outside. The one by the bobbin is the one that should control the feed dogs on yours. Make sure the switch is all the way over and not half way.
Also take the needle plate off and look under there for threads, lint, or something else that could be hindering the feed dogs. You can see a lot more with the plate off.