You sound fairly handy, since you were able to open the case and all. The most likely cause of your issue, when you were reassembling the vacuum halves, you disconnected one of the wires that goes from the cordwinder to the dust bag door, where the hose plugs in. You will have to open the vacuum again to check for the loose wire. Another cause but it is not as common, there are two wires that connect to the throat where you plug in the hose, one of those wires, generally the black one has a fuse in it, looks like small lump in the wire, it could have blown out.
Also look into the hose throat make sure the two brass contacts that touch the hose are in place.
check above if you still have a problem send me an email---for free advicce.
danddvacuum@comcast.net
vacfixer
December 2007