I've had similar problems in *Kubuntu* between my Audigy 2 sound card
and built-in VIA 8327 audio chip.  To troubleshoot them I tried playing
sounds at each level of the Linux audio stack. It helps to have speakers
connected to every possible output.

ALSA:
Use `aplay -L` to get a list of your output devices, and try playing through 
them, e.g. for me `aplay -vv -D front:CARD=Audigy2,DEV=0 
/usr/share/sounds/SOME_WAVE_FILE.wav` plays on my Audigy2 card. Use `alsamixer` 
to see if anything's muted.  More tips in 
http://alsa.opensrc.org/index.php/TroubleShooting

PULSEAUDIO:
Use `pacmd list-sinks` to get a list of your output devices, look for name: 
<xxx>, and then try playing through them, e.g. for me `paplay -d 
alsa_output.pci-0000_00_11.5.analog-stereo -v 
/usr/share/sounds/SOME_WAVE_FILE.wav` plays on my Audigy2 card.

I can't help you with the higher levels of gnome, my understanding is
there are tools like pavu and pavucontrol...

I found PulseAudio preferred my Audigy 2 over my built-in VIA 8237, but
I wanted the latter (I get screeching noises through my Audigy 2 output
if there's any network activity).  It turns out PA had decided to mute
the built-in audio chip and sometimes this doesn't show up in the KDE
mixer control.  If that's your problem, look for muted: yes in the
output of `pacmd list-sinks`.  Once you've figured out the problem there
are ways to get the audio layers to do the right thing ranging from
(roughly) `asoundconf set-default-card Audigy2` in a .asoundrc file to
`set-default-sink` in default.pa file, to messing with udev rules.
Instead I just manually go in to the KMix GUI and unmute and choose a
preferred device.

I hope this helps, good luck!

-- 
Pulseaudio is not running (second sound card without sound)
https://bugs.launchpad.net/bugs/665751
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