Make sure the reset button on the bottom is not popped out. If your disposal has a cord, make sure it is plugged in and there is power to the disposal. If your disposal has a cord, and there is no power to the disposal, check the breaker or GFI on the wall. If your disposer is hard wired into the wall, check the circuit breaker behind the electrical panel. If humming it is probably jammed. Use the small wrench that can with your disposal to unjam it and stop it from humming.
Lowe's offers garbage disposals like the InSinkErator Evolution and Badger garbage disposals in various horsepower options. Models with lower horsepower tend to become jammed easily. What if your garbage disposal jams? No problem. Simply locate the hex socket in the center of the underside of the disposal. Grab a hex wrench, put it in the socket, and work it back and forth until you feel the blades loosen up. Once the blades are spinning freely, press the garbage disposal reset button. It's that easy.
Turn off the garbage disposal at the breaker box. Remove the drain pipe if it is leaking there. Most attachment clamps are wire clamps with two protruding wires that are pushed together to release the drain pipe. Push the wires together and remove the clamp. Pull the pipe off and inspect the seal for any debris that may have lodged between the seal and the pipe. Wipe the seal with a damp rag to remove any dirt, debris or food particles. Sometimes the wire clamp loses tension. In that case, tighten the hose clamp down in its place, which may secure the pipe leak-free.
Another common cause for a leaking garbage disposal is the disposal flange. A leak at the very most upper area of the garbage disposal could be the garbage disposal flange which goes through the sink. A garbage disposal flange should be sealed with Plumber’s putty and then tightened from underneath the sink. If this is not tight enough or if it has managed to come loose (which can happen) then the garbage disposal will have to be taken down so the flange can be resealed and then the garbage disposal can be rehung.