I have a funny symptom.
My receiver was nice but is dated. It's inputs are coaxial digital and optical.
I bought a new Sony BDPS 6200 Blu Ray to replace an old dead HTPC. The HTPC had been connected previously to the coaxial digital inputs.
When I hooked up the Blu Ray, I hear a faint buzzing through all speakers that is independent of volume. I was reading about grounding loops and all sorts of things so spent an hour tinkering. Changing the plugged outlet didn't work. My components (projector, cable box, blu ray and receiver) are all plugged in to the same power surge protector, so on same circuit.
I eventually figured out the sound occurs when the coaxial digital cable is hooked up. It happens with 2 different cords but one is an RCA cord. I have some old high end video component cords but forgot to try those. Curiously, the sound occurs on all inputs and does not vary with volume. As soon as I unplug it, the sound goes away, even when watching TV (a different input on receiver). The cable is hooked up via optical.
I thought the Blu Ray had an optical plug but it doesn't, so I can't try that. It only has HDMI and coax.
Not sure if I need to send it back to get one that has an optical?
Thanks for any thoughts.
These forums save so much time.