I experimented more with the HDMI and uncovered a similar bug with the 5054 that others are getting. I connected an Onkyo upconverting DVD player via HDMI and about 1:50 into the movie when the audio quit working. What frustration! If you turn the TV off and then back on, the Tv volume starts working again. This must be a design bug that shows up once things warm up. I will call the support line and maybe try a different HDMI cable, but if that fails, the set goes back to the store. It is a bummer because this set looks nice with the HDMI upconverting DVD. Be on the lookout if you connect up to HDMI, because I think this is a design flaw.