It’s dead. No hum, no grind.

The switch does nothing. That is power, or a dead motor. Silence is not a jam. A jam usually hums first.

Check power before you buy a unit

1. Wall switch. Confirm it is on. A half-switched or dead switch is common.
2. Breaker. Find the kitchen or disposal breaker and reset it once. If it trips again when you run the unit, see trips the breaker.
3. Red reset. Press the button on the bottom of the unit. It pops after a jam or an overload. How to find and use the reset button.
4. Cord or hardwire. If it has a plug, confirm it is seated. If it is hardwired and you smell burnt insulation, stop.