Over-all too many problems!

There is a motor just for the beater bar, and a belt that connects the motor to the beater bar...either your motor is bad or your belt is broken

wrong belt or some dont tighten untill you drop handle

The most likely problem is something was not put back together properly in the clutch. You can move the belts by hand with the clutch out of the machine. Move the motor belt and switch the lever off and on and see if the brush belt is turning on and off. It not you will need to take the clutch apart and reassemble it. Test it before installing.

This certainly suggests the clutch has packed up, although it is possible that the belt that runs from the motor to the clutch has failed (I assume you've checked the other belt, as it's very easy to see). Changing the clutch, and the motor-to-clutch belt, is not a job for the faint-hearted. If you want to see what's involved go to www.dysonmedic.com scroll to the bottom of the page and click on DC07 clutch replacement.

When the vaccum is upright, the beater bar is not engaged. When you tilt the handle back, the clutch engages and the beater bar begins to turn.

There are two likely possibilities for the "screaming noise". First, and most likely, is that the beater bar cannot turn because of a build up of debris or the beater bar is broken. In eaither case, the clutch belt is spinning on the non-moving beater bar causing the noise. Remove the beater bar, inspect for hair, carpet fibers or other items wrapped around the bar. Also inspect for cracks in the plasitc at the ends of the bar. Clean or replace the bar as needed.

The second possible cause is the clutch assembly. If you were unable to fix the problem with the first solution, it is time to take the vacuum in for service as replacing the clutch is somewhat difficult.

Here is a YouTube video link that will walk you through the process of removing the beater bar as well as the clutch if you decide to go it on your own: http://www.youtube.com/watch?v=7_CtaFcc5HU

Hope this helps.

Sounds like it broke a belt. They do smell awful.

Check your clutch to make sure it's engaged. There should be a knob on the foot of the vacuum that can be turned to stop the roller.

Sometimes dust,lint and thread can work its way into the bearings on both ends,take the beater bar out and see if you can turn it in your hand,if it doesn't inspect the ends and clean them.Use what ever you can find to pull out the threads.Or take it outside and hose it off.

YOU MAY HAVE A POSSIBLE BAD BELT OR THE MOTOR THAT RUNS THE BAR MAY BE BAD, THE OTHER POSSIBILITY IS THE SWITCH THAT TURNS ON THE BAR MAY BE BAD. OR A WIRE COULD HAVE COME OFF THE MOTOR. i THINK YOU DO KNOW THAT THE BEATER BAR DOES NOT RUN WHEN ON WOOD FLOORS.

You need a new belt, they stretch after awhile and will slip.