This is the most critical step. You are about to stick objects (or your hands) near sharp blades. Even if the switch is off, a power surge or accidental flip could turn it on.
If your InSinkErator is humming but not spinning, grab a ¼-inch Allen wrench. That $3 tool will save you a $200 service call. Stay safe, keep it clean, and happy grinding unclog insinkerator
If the motor is spinning but the sink is full of water, the clog is further down the line. This is the most critical step