I am having this issue right now. I have HDMI to HDMI, video is great and I've tried all the resolutions posted.
I can't find the TV anywhere to make it default for audio. Only thing that appears in sound is my computer speakers. This worked until a week ago and i think someone deleted the TV in the sound window. How do i get it back?
I've disconnected, reconnected, booted the pc with the tv on, with it off, I believe I've tried it all, so someone please HELP!!!