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What is the brand and model number of your unit?
The only reason your new disposal wouldn't run is if there is no power to the unit. I've never heard of a new unit tripping the reset. That usually only happens when the motor is jammed up. It sounds like you have a wring problem. A new disposal which was wired properly shouldn't blow a fuse.
Did an electrician wire this up?
You bought a new what? a fuse?