[LAU] no sound in ubuntu studio 13.04

I installed Ubuntu Studio 13.04 and have no sound. I reinstalled the system
due to some video card errors I could not bypass after an upgrade from
Ubuntu Studio 12.10, but on the old system the sound (and video) was
working. The only thing I had was a sound from the microphone, after I
unmuted it in alsamixer. No other playing or recording was available.
Can anyone help me with this? I wouldn't like to go back to 12.10, install
all programs and updates again.
Thank you.

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