Upgraded to Lion and now my iMac doesn't recognise any sound output devices?

Any ideas on how to solve this? "No output devices found" is what the system preferences show under Output.

Hi Philip..
Preferences (.plist) may be corrupted after the upgrade ...
Go to ~/Library/Preferences
Move the com.apple.systempreferences.plist file from the Preferences folder to the Trash.
Restart your Mac.

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