I just got mine today and it isn't in a case. It sews but makes a "knocking" sound when it does. I'm thinking it's because it isn't in a base. It's just sitting on a folding table. Mine is making very pretty stitches though.
One thing I had to double check was the wheel inside the hand wheel was not tight. I tightened it up and she begin sewing away!
I was just searching for the owner's manual to read until I can buy one I'm watching on eBay.