Replaced belts and brush roller will not rotate.

check to see if the spindle (small pencil-thin metal rod) is spinning where it projects from the motor. the belt wraps around this rod. if the rod is spinning when the vac is turned on your brush roller could be jammed. the bearing in the far sides of the brush roller frequently pick of long threads and hair and will stop the brush roller or the bearings sometimes overheat when worn and plastic will melt in this area causing stoppage.