I have a new Samsung HLS4666W with a surround sound system hooked up to the audio out. I usually leave the internal sound on mute and listen to the sound through the surround sound system. This weekend, i powered everything up and had no sound. At first I thoughjt I had accidently turned off the surround system, but it was powered up. I checked all the cables, then hooked up the tv to a different amp and still no sound. I turned off the internal mute and the TV played sound normally. Frustrated, I "rebooted" the Samsung and sound came back! It has worked fine since then. Has anyone experienced this before?