Not every garbage disposal was created equal, and it can be difficult to discern which one is right for your home. After all, a quick internet search will show you that there are hundreds of different models to choose from. You shouldn’t automatically choose the cheapest or best rated garbage disposal. You need to find the one that is right for your unique needs.

If you can hear your disposal’s motor humming, but the disposal won’t grind, sounds loud, or starts and stops, it’s probably because something jammed it. Disposals jam when something gets lodged in the “flywheel,” which is what the disposal’s rotating plate is called. You can fix it yourself, but remember: NEVER stick your hand down the garbage disposal. Ever. Seriously.
The majority of today’s garbage disposals are designed to dovetail with a sink’s drain outlet, which makes connecting the two components simple. There are a multitude of connection kits and adaptors available. Many models feature a power cord that is simply plugged into a nearby outlet to power the unit; however, when an outlet is not available, the unit must be hardwired, which can be significantly more expensive.
Whether you repaired or replaced the leaking garbage disposal, test for any missed problem spots. Wipe the unit dry with a clean cloth, then unplug the sink drain (if plugged) and pour a few cups of dyed water into the drain once more. Use a flashlight to inspect the entire unit. If you don’t observe a leak, turn on the power to the disposal from your breaker box and plug in the disposal at the wall outlet.
At one point, I did have a leak that I eventually determined was due to improper installation. (This was by the same "professional" plumber who reversed the hot and cold supply lines when installing a kitchen faucet. He just didn't connect the drain hose properly.) While investigating the issue, I called Waste King to inquire about possible in-home service or warranty replacement. I was blown away by their level of customer service: no waiting on hold, just an immediate connection to a person who really knew the product and was unexpectedly diligent in resolving my problem -- which, as it turns out, wasn't even their fault.
Waste disposal units may jam, but can usually be cleared either by forcing the turntable round from above or by turning the motor using a hex-key wrench inserted into the motor shaft from below.[25] Especially hard objects accidentally or deliberately introduced, such as metal cutlery, can damage the waste disposal unit and become damaged themselves, although recent advances, such as swivel impellers, have been made to minimize such damage.[citation needed] More problematic are drain blockages caused by shredded waste that is fibrous, e.g., artichoke leaves, or starchy, e.g., potato peelings.
If your garbage disposal just won’t turn at all, then it’s very likely that the disposal has lost power. Your unit may have blown a circuit, or it could be unplugged. First, check the plug for your garbage disposal to ensure that it’s secure. Next, locate the reset button on the underside of the unit, and push it. If neither of these things fixes the problem, look inside your electrical panel for signs of a tripped circuit. 

Garbage Disposal Repair or Replacement