Well, a head-scratcher: Updated to Itunes 10 for windows 7x64 bit. It wouldn't let me update the 32 bit version. All worked fine before that. My daughter's macbook still plays through the stereo fine, via the airport express. But, my pc Itunes, finds the airport express, when I click play it says it's tuning into it, then it plays according to the pc screen, but nothing - no sound. Checked volume controls, which keep resetting to zero by the way, but even when they are up, no sound. ????? Any clues?