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The "frequency" of the grinding/buzzing sound is somewhere between the motor speed and worm speed, so It sounds like you might have a problem with the gearbox. The motor is obviously working, but it looks like either the motor is not meshing properly with the gearbox, or maybe some teeth have stripped inside the gearbox...
Did you buy it new or 2nd hand. Are you comfortable taking the motor/gearbox off to have a look?
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