Hi all, My new AV receiver (Denon AVR-x3000) and my new plasma TV (LG 60PB6600) both support HDMI ARC. I've turned it on in my TV and looked in my AVR setting and have not found related setting so I beleive it must be turned on by default? Anyway I can't get it to work when watching youtube or other online stuff directly from the TV. I beleive my HDMI cable are just too old and doesn't support this standard? I think they are HDMI 1.4 from about 3-4 years old. I'm I mistaken or I just don't see something that I should? I don't want to buy new cable if not required I've already got 2-3 that I don't use anymore.