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Buzzing is usally AC line noise leaking into an un-shielded cable somewhere or a floating ground. If the AC plug is reversible, try that. Sometimes the buzz is from an attached device. Make sure all audio cables are plugged in tightly at each end and routed away from or at right angles to any power cords and away from other sources of strong magnetic fields like TV's.
Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights.
I've also seen variable track lights induce noise but it's usually minor.
Try rotating the power cord in the wall outlet.
If it still buzzes with no cables or anything external attached there's an internal problem.
This happens at many phones due to the speaker which buzzes because of the waves made by the conversation. For example try calling someone and be near a desktop pc speaker or radio and you'll hear the same buzzing noise
The buzzing noise is being heard probably because there is another electronic device around that's using radio waves to function. (Such as a cell phone, a cordless phone adapter or a wireless router. Even microwaves and ceiling fans can give off these sounds.)
My advice would be to try and move around or turn off some appliances in your room that may give off radio waves.
Try to see if the reciever will make the buzzing/noise without anything connected to it except power, and speakers. Tune into a local radio station and see if the noise continues. If the noise has stopped, then you know there is an issue with the player or cable.