try checking the belts.
Remove the soleplate, brushbar and the housing surrounding the clutch, there are THREE screws 2 holding the clutch in and one that can be accessed by moving the brushbar housing so its inline with the main upright body, you will also need remove the rubber piping that runs through the small channel and the clutch surround will pull out, then you can see the motor spindle the motor belt is slimmer then the clutch to brushbar belt, if the belts have gone then you will also need to either replace the clutch or strip the clutch to gain access to the belt.
Look up the clutch removal and stripping on google
Dyson Mania, April 2007