Roomba Discovery. My Roomba turns on and moves but the brushes won't turn. Someone told me that I

Question

My Roomba turns on and moves but the brushes won't turn. Someone told me that I had forgotten to put in the yellow and black end bearings, but I did. Help, I miss my RoombaI have a Roomba 530, I have had it for 2 weeks and really loved it. I have followed all the cleaning instructions etc.. Then the Roomba wanted it's brushes cleaning "please clean Roombas brushes" So thinking that something was stuck I removed and cleaned the brushes, (yellow tabs on and in place by the way) Now when I press clean the hoover cleans for about 1 minute and then stops with the same message "Please clean Roombas brushes. I looked at the trouble shooting page and breifly removed the hoover tray whilst running the Roomba and could see that the brush was NOT turning! Can anyone help and give some advice as I really miss my Roomba...thanks Louise ;-)