Buzzing sound almost like the fan is staining to rotate.
If you manually start the fan rotating and then switch on power, will it start up OK? You may have a bad winding in the motor or the fan is mechanically bound up in a specific area but once it goes past that it may continue to rotate.. Or.. your fan motor may be damaged. Buzzing is normally associated with the motor unable to get past a bound up spot .. Hope this helps..
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