ctrlbreak,
Have you tried uninstalling virtualbox modules to see if sound comes back?
If this is the case indeed, can you attach here the dmesg without the 
virtualbox modules, when the sound is working and with the virtualbox modules, 
when the sound isn't working?

-- 
no sound hardy kernel 2.6.24-12 
https://bugs.launchpad.net/bugs/200338
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