Sound stuck in Mute and volume keys won't work

The other day, I happened to Mute my sound. Now, it will not let me return to having sound. I have tried the volume up and volume down keys, but they don't respond. I've tried adjusting the sound using System Preferences, but to no avail, since there is nothing listed in the "output" window. I do get a start-up sound when the system boots up, so I don't think the speakers have died. And the sound still doesn't work if I plug headphones into the jack... anyone?
Thanks -
ibook   Mac OS X (10.3.9)  

thanks - I tried that - for some reason, I decided to just back up recent files and reload the 10.3.9 update and now all the keys are working again.... Thanks for your input - I don't know what little demon was posessing the ibook, but I'm glad reinstalling the update killed it.

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