Glad you got it working. For now. It doesn't sound like a handshaking issue, at least I've never experienced weird sounds. Most of the time, handshaking will give you either no sound, no video, or both.
Just in case, If it does end up being a hdmi handshaking issue, You might look into a gefen hdmi detective. I had all kinds of handshaking issues. I installed a gefen detective last night, and so far, so good.