Check whether the capacitor is normal, because the capacitor of the short circuit, open circuit, grounding and aging can make the motor can't start running normally, if the capacitor is not normal use, must replace the same capacitor, motor will start running normally. Finally, check whether the motor is normal, especially if the starting windings of the motor will not be broken, and it cannot start normally. If it is not normal, the new motor should be repaired or replaced.

    Have the "buzzing" sound, but not the motor start, basically is a motor starting capacitor performance degradation or damage to the cause, you had been apart to see, the belt is no problem, suggest you disconnect the power supply, check the capacitor motor wiring, should be able to clearly see capacitance for cracks or explosion bulge phenomenon, in that case, change the same set of capacitance, the general capacity of 8 to 12 micro method, pressure value, you can choose and buy of 350 v, also can choose and buy is 450 v.