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Check with "aplay -l" (in terminal) that you have drivers loaded - it will list all active sound cards. If you see some (card 0, card 1, ...), try "low-level" mixer (in terminal too): "alsamixer". Set your volumes there, and it should work. Try playing some wav file with "aplay /usr/share/sounds/question.wav". If all these work, than maybe PulseAudio is causing some problems or is not configured properly. I removed all pulse* stuff from my Ubuntu, and all works great.
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