Brush wont turn belt not broken no sure how to get to shaft to see if it is turning

I can't tell for sure from the pictures, but there are two possibilities - the drive belt to the brushes broke, or the brush can't turn due to excessive hair wrapped around the shaft. If the belt is OK but the brush does not turn, you should smell burning rubber.

If the belt is broken, you have to remove the bottom plate to expose the brush, remove the brush and the broken belt, and replace the belt, and put it back to gether. While you have the brush out, now would be a good time to clean it - remove the hair, etc from the brush and around the shaft. Good Luck!

Simply lay the machine down with the brush assembly facing upwards, and remove the four screws holding the bottom plate in place, and remove it. Put the new belt around the motor shaft, then around the brush assembly and push the brush back into place. Turn the brush with your fingers before replacing the bottom plate, to be sure the belt isn't caught between the brush and housing.

Turn the PN bottom up. With a Phillips screwdriver, remove the six screws in the base. Turn PN over and lift back of cover, then gently manipulate it until it comes off.
Slide the belt off motor shaft, if necessary. Remove the screws on each end of the brush and lift the end of the brush so you can remove the belt, if necessary. Place new belt on brush and place brush into slot. Replace screws and tighten. Pull belt back to motor shaft and slip on. Check belt for tautness. There should be a little play, but not much. Make sure belt is placed correctly and rotate brush a few turns.
I recommend cleaning the inside of the PN while you have it apart. Use the dust brush to vacuum as much as possible out.
Make sure the light cover is in the correct position. Carefully place front lip of PN cover into slot in front.of the PN. Carefully settle cover in place. Check around the PN to ensure cover and base are correctly placed. Turn PN over and replace screws, short one in front.

I do recommend letting a trained Aerus Electrolux tech do this, especially since the belt will have a one year warranty if he/she does it. Of course the belt should last longer than that, anyway.

Check that the belt is not too slack and that the brush bearings are not too tight, or that some lint or thread is caught around the brush shaft.

If the motor runs when you switch on, but the brush roll doesn't revolve, then there may be a broken belt. I wonder how old your vac is? Sebo belts are very high quality and they usually last 10 years at least.
Before you go to the trouble of checking the belts, check the brush roll and its drive shaft. Remove the brush roll and check for signs of damage at the end where it engages the drive shaft. Also see if you can easily rotate the drive shaft - if you can, there's a belt broken. To confirm, lie the machine down so you can see the drive shaft, then switch on (keep fingers clear!) and look to see if the shaft is rotating. If you can't turn the shaft by hand and it does rotate when you switch on, then the belts are OK but the brush roll may not be locating properly and you probably need a new one.

To check the belts you need to get the cover off the base, as follows: separate the base from the bag compartment by pressing the button at front bottom of bag compartment then just pull the two apart (a gentle lever may help). Then turn the base over and undo ONLY the four deeply recessed screws (you will need a cross-head screwdriver). Turn the base right-way up again and lift off the cover. You will then see the belts.
If you find the belts are both good, or if you find one broken and need further help, post a reply here, tell me what you've found, and I'll guide you through the next steps.
Good luck!

Check your belt. Could be broken or loose.

Either the glide plate at the bottom is blocked or the belt is broken

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Thanks
Rob

most likely the belt is broken. Bad news regarding all Dyson's. You can't replace just the belt your self. You have to purchase a new belt assembly which includes the gears. And it wont be cheap. I would call it a design flaw but i am sure that dyson calls it a profit scheme.

There is no belt, the brush block is turned by a turbine. Check the brush block, make sure that the shaft that goes into the turbine isn't broke off, If ok, then replace the turbine, or take it apart and clean it out.