I should mention that I have posted this in the home pc section. I was reading posts and suspect this is where I should have put that posting. If I have screwed anything up I do apologize. This is odd. My problem is that certain files may, or may not, play audio. This is, I think, a file based problem. I have an ugly betty episode (s03e14) The audio almost plays in powerdvd (background, no speech and eventually nothing), xbmc plays the beginning background, over and over again - no speech, vlc starts with the background and then simply goes silent, mplayer acts like xbmc. I have no clue what is going on. Is there a good diagnostic that could tell me what may be going on or does anybody have a clue? My audio comes off the hdmi cable, I am using an ati radeon hd 3650 display card and a denon avr-788 receiver. I usually have no problem at all except with these isolated files. I am wondering if these files are simply defective. Are there any programs that might either diagnose, or test, a file? I have tried a couple but they see nothing wrong. Thank you........