Try pushing down on the feed tube while snapping the line along the back into place. If they aren't all lined up there is no electrical connection. It may not be broken, and you just need the children to connect the pieces (sorta like the child proof caps-). I have to hold the pieces in the tube down as I slide it into place, they are kinda springy...anyhow, be gentle, and try to get all the magnets in the tubes lined up...good luck
mf, May 2008