I just bought the Eurythmics Greatest Hits DVD and it won't play properly (no sound) on my system. I have the latest PowerDVD, SB Live card, etc. All DVDs I have work fine, just this one (my only music DVD). I see the video just fine, but there is no sound. There is a sticker on that box that says remastered in 5.1 but I've seen postings that it is in 2 channel stereo. If it is, would I not be able to get the sound with the ditial out?