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It's good to have another user account for troubleshooting, that's kept relatively 'clean'. If you don't have one, set it up now with admin privileges.
If you can log into the other account and have sound, you'll know it's an issue with something (likely a pref of plist) in your user account. If you get no sound on either user, then the problem lies at the root level somewhere (again, possible a pref or plist in your root library folder.)
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