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Sounds like a jam. The bottom of most disposals has a spot for an Allen key to manually turn it in the event something is blocking it. Depends on the model so I would check but most have that there as a way to clear a jam. An old-school method is to angle a broomstick handle in there, and try to spin it that way. If you don’t have a spot underneath. If this doesn’t solve the issue it may be time for a replacement.
