Can you run the system with music or a movie for an audio only test? That is disconnect your tv from the system completely. First the power and then remove any interconnects like HDMI and cable.
Did this early on. The only circumstance in which the buzz occurs is when the TV is on, and the TV doesn't have to be connected to anything other than the power socket -- removal or addition of other connections makes no difference.
Was the buzz happening while you had your equipment or did it just suddenly begin?
Started when the TV was installed.
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