Brush will not rotate but still has suction - Dyson DC07 Bagless Upright Cyclonic Vacuum

this vid may help you

remove the brush from the enclosure. use a quarter rotate the cover, pull out the brush and clean any debris. operate the unit before installing the brush to see if the device in fact operates as designed. if not replace the unit, if so install the brush and bust out laughing!

Brush motor reset button? Clean out brush.

There are much quality differences in belts but the foot pedal with arrow is made to set the hightbecarefully because of easy broken pedals . but if the brush is setting on the deepest stand then its not rotating anymore and the brush stands still. its very easy how you can disassemble the brush and can place them in 3 differend levels in height ? on the grey bearing holders outside of the brush there are 3 different indications l and ll and lll the best is to set so that the carpet if its a thin one the brush must setting just lower then the suction mouth so that the brush are more coming out so deeper come out of this suction mouth so that the suction mouth has made a little more distance from the carpet because when the brush rotate to deep insite the suction mouth .1 the tension of the belt on the brush is lower and .2 the suction mouth sucks vaccuum on the carpet and the brush doesnt rotate because of the force of suction power, play around with the different heights you find the right level.

There may be a clog where the air flows from the brush roll into the vacuum

Brush head may need. To be cleaned or replaced

check for blockages
http://media.dyson.com/downloads/UK/floorcare/Manuals/DC23_origin_uk.pdf

When you say taking handle back I assume you mean the action to start rotation of brushes. Had simular problem and found by removing brush from tube and then cleaning "baked on rubbish" in plastic tube (so you can see clearly through tube) Clean with stiff brush and also making sure brush drive belt housing is also clean and allows brush to rotate square to housing did improve the suction power.
I assume you have cleaned all filters by wahing under running water and applying a little pressure to remove water and attached dirt?

you probablly need a new belt clutch it should go to a vac shop it isnt an easy fix

If the belt is stretched, then it can't turn the brush rol under load, if you haven't chenged it in the last 6 months, then I would put a new one one. Also check the dirt inlet by the brush roll for a blockage.