Skerdi, as you've noticed, not a ton of ideas forthcoming yet, and what you describe is puzzling. There's no problem playing CDs(without the TV, of course)and a problem with all three types of connection to the TV, which disappears when the video connection is removed. Is this "annoying noise" like a ground-loop hum which goes away when removing the cables breaks the loop? Of course if there was no problem when you did this before, it's curious that a ground loop would suddenly appear.

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Enjoy the music, not the equipment.