If your disposal hums but doesn’t grind when you switch it on, something is probably stuck inside. Shut it off, then push the reset button or the reversing switch on the bottom of the unit. Newer disposals often have a hexagonal fitting for an Allen® wrench on the bottom. Insert the wrench and turn it back and forth to free the mechanism.
With older models, a more brutish approach may be necessary. Lever a broom handle against the side of the drain opening and against your disposal’s blades. Move the blades back and forth to release the clog.

Safety
Always remove the Allen® wrench before you turn on the disposal. If you don’t, the rotation of the now-free motor can throw the wrench.
Never put your hand in a disposal to clear a jam. Turn off the power to the unit and use tongs or pliers to reach in.

Note
Never put fibrous vegetables like celery and artichokes in the disposal.

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