Not sure what I did wrong. Following a fresh install to 12.04 and downloading a few things (evolution, icedtea plugin), sound was working. Then it stopped, and won't come back. No sound from speakers or headphone.

I rebooted from the 12.04 live cd, and still no sound. I noticed in System Settings > Sound > Output that the only device listed is "Digital Output (S/PDIF) Built-in Audio". Running the sound test yields only silence.

I rebooted from a 10.04 LTS live cd, and sound returned. I noticed in its sound settings that the output device is "Analog Stereo Built-in Audio" (or something like that).

I suspect if I could get 12.04 to use Analog rather than Digital output, my sound would return. But I don't know how make the switch. Any ideas?

Thanks! ..DonA