I lost the sound. Sound inactive.

I wanted to play a video on my TV, so I connected all the necessary cables from my PowerBook G4 to it. I do this all the time and I've never encountered a problem. But this time, I lost the sound output from the computer. Whenever I press any of the sound keys, the icon shows up but there's a "no entry" symbol below it meaning I'm unable to adjust anything. Likewise, the sound icon in the menu bar disappeared leaving a strange gap in it.
Anyone know how to fix the problem? It seems rather random.

Choose a device for sound output > Nothing
There's nothing listed. No output devices found. Everything in that window -- including the submenus -- are greyed out. I can't make any changes.
One funny thing happened, though. I went to the Apple Store today and as soon as I got into OS X, the volume started working again, as if nothing had happened. I got home and the volume disappeared again! This makes no sense.

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