Unfortunately the answer above is far from helpful. The filter has absolutely nothing to do with your brushes not spinning, and you can really replace the turbine yourself without having to take it into a shop to fix it. Here's a much more helpful diagnosing of how to check the brushes, and fix the turbine if needed.
There can be serveral things that may have gone wrong with your Hoover so that the brushes stop spinning. Unlike the other "expert" above I will walk you through step by step on how to diagnosis this problem, and fix it. Unfortunately there is no belt or band on this model, but instead it's actually a turbine assembly that drives this brush.
Possible Problem #1. Usually the most common problem when the brushes stop spinning is that the brushes have simply gotten clogged with something that is preventing them from spinning. Especially if you have pets in the home, this is a common problem. Here's how you can clean these brushes.
First, turn the machine upside down so that the brushes are facing upwards. Pull down on the upwards on the brushes and they will easily snap right out of the mahcine completely. . Use a pressurized water hose with spray nozzle is ideal) and spray each brush with water to dislodge any pet hair. You should be able to get these brushes spinning when you spray them. Spray each brush until the brushes are spinning pretty fast. Re-insert the brushes into the machine, and test to see if the cleaning has fixed your problem. It's important to make sure that the brush switch on the top of the machine is turned to "Rotating Brush Speed Hi", and that the handle of the machine is reclined down. There is an internal switch inside the machine that turns the brushes off when the machine is in the upright position, so you'll need to step on the handle release pedal to ensure that this switch is engaged. Hopefully the brushes just needed to be cleaned, and they will now work now that you have reinserted them. If this still didn't fix your problem, move on to the next possible problem.
Possible problem #2: If the cleaning didn't fix your problem, remove the brushes from the machine again. Once the brushes have been removed, the handle reclined, and the brush switch turned to fast, turn the machine on. Where the brushes were sitting you'll see a square shaped hole (pictured below) that the brush stem fits into that actually spins the brushes. This part should be spinning while the machine is on. Here's a picture of that part:
If this part is not spinning, then your Turbine Gear Assembly has gone bad and needs to be replaced. If this part spins however, then this indicates that your brush block is gone bad, and needs to be replaced.
Here are links to the exact parts for your model that may need to be replaced:
Turbine Gear Assembly:
Here's also a link to a Fixya repair solution that I've done explaining step by step how to replace the turbine gear:
I hope this helped you, please be sure to rate the repair or leave feedback if you found this repair to be helpful.
Thanks so much,