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the loud buzzing is the relay on the compressor, this is what starts the compressor, these fail a lot on these, I would replace it and if it still buzzes and the compressor still wont start then the compressor has failed, you can order this @ http://www.repairclinic.com/PartDetail/Start-Device/67005560/1159182?modelNumber=MFF2557HEQ . it plugs onto the side of the compressor.