I experienced the exact same problem you describe in the original thread. No sound from any application except for incoming calls. I tried multiple soft resets with no results. I even tried adjusting the volume from the homescreen by holding down the jog dial......nothing. I eventually gave up.

A few days later, the sound came back on. I don't know what changed, but it's still working today. I think it's a software bug. If your sound doesn't came back after a couple of days, I would suggest getting a replacement.

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