It is possible that the magnet in the black hopper that engages with the juicer and allows it to turn on has come loose. Do you happen to have any other type of magnet in your home that you could test to verify this? You would simply need to turn the juicer on and hold a magnet over the orange arrow on the motor housing. If the unit turns on then you need a new hopper, if the juicer does not turn on the juicer may need to be serviced as this could display a motor issue.
