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If the motor is humming but cannot turn, the motor is failing and will need to be replaced.
Your initial post stated, "it first turn to form a dough but then couldn't turn any more." So it does turn when it starts to labor and bog down or it will not turn under a load?
There must be an issue in the gearing then that is failing under a load.
That model is not really serviceable, they don't even sell replacement parts for repair, only the bowl and attachment stuff. See the link below.