I also have the same symptoms here, I submitted bug:

https://bugs.launchpad.net/ubuntu/+source/ubuntu-meta/+bug/580227

Its been plaguing me since i upgraded my eeepc to 10.04. My theory is
some PolicyKit, or Hal config file did not get properly upgraded.

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System boots with no sound and cannot shutdown or restart
https://bugs.launchpad.net/bugs/584337
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