B&K AVR-307 Receiver "baffle noise" Questions

...loud buzzing noise coming from the receiver AVR307 not through the speakers?? Either some shielding baffles are loose and are vibrating or the transformer itself is generating too much sound . This ...

...series LCD and it seems to be sending some sort of interference down the HDMI cable but I'm totally baffled how (because the noise remains when the TV is powered down). I am just about to start ...

...noise do you like to make and how loud and equally importantly how much room do you have; are the speakers to stand on a shelf, on the floor or be suspended from the ceiling? Generally the bigger and ...