The manual for the DC07 can be found here (
500 Error Dyson
) (The PDF tag is saying 'Error Dyson', but it still seems to work in getting to the document)
The most likely issue, under-documented for most Dyson uprights, is that the wand suction will *only* engage when the main handle is in the full upright position. In that position, the brush motor will also always stop spinning. I found this out after much wondering when I bought a DC07 at a flea market. Got a great deal when I plugged it in there and couldn't get the brush to spin, and the storage locker clear-out guy just wanted to get rid of it. That said, it's a common point of dodgy documentation for the upright Dysons, IMO.
It could also be line blockage. Remove and check the U-Bend piece, remove the hose line (un-clip at the bottom and pull off), stretch it, and see if there are obstructions. My fave way to deal with blocks in there is to use a pair of pliers to bend a small, blunt U-hook in a wire coat hanger that's been bent into 'marshmallow-roaster' long-skinny shape, then go in carefully from the ends and see if you can hook stuff and pull it out. Some crumpled paper can be amazingly effective at tenaciously holding to the walls. Be careful to look through the stretched hose wall when doing this to make sure you don't hook the hose wall and tear it.