Hi,
I have exactly the same problem as you Fab.
-null output
-empty hardware tab

I have already tried everything recommended to you but it still does not work.
Also would like to know if there is chance of getting sound back after 
downgrading from karmic back to jaunty because in my case problem started after 
upgrading on karmic.

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[karmic] pulseaudio: card not found - Null Output
https://bugs.launchpad.net/bugs/394500
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