Updated to iTunes 11.0.3, now no sound on my computer, all apps

Hi--
I updated to iTunes 11.0.3, and now there is no sound on my computer. I unplugged the external speakers--no sound from the iMac built-in speakers. No sound for iTunes, GarageBand, QuickTime, or Firefox.
Is anyone else having this problem? And is there an easy way to restore the previous version from Time Machine? When I tried, I got an error message saying iTunes was needed by Mac OS X.
iMac running 10.7.5.

Oh, fer crying out loud... I got sound back when I restarted the computer--rookie mistake. But why should I have to restart to get sound? I'm going back to my usual practice of waiting a month or two to install updates to iTunes.

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tt2

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tt2

Updated to iTunes 11.0.3, now no sound on my computer, all apps

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