Volume won't adjust after long periods of sitting

Hello.
Last night, I set my iBook aside, set up like a sort of tent, and went to sleep. It had work to do, I didn't. To prevent it from interfering with my sleeping, I turned the backlight off, and muted the volume.
Now it's the morning. I decide to check my mail. I turn up the volume, but nothing. The OS gives me a long (> 0.5 sec) delay between when I push the button, and no sound! Just to eliminate hardware as a problem, I hooked up a pair of headphones I knew to be good (they better be good, I used them last night), and got the same results.
The problem happens on and off, and I am unable to reproduce it on command. At the moment, my solution is to reboot, which usually fixes the problem. Start-up chime and all. I'll restart the Finder, on a hunch, but it does nothing.
Thankfully, I don't have an overpowering urge to listen to music, or watch some videos right now, so I'm going to try and keep from rebooting my laptop in an attempt to track down the problem.
Thanks for the help!
iBook G4 12-inch (1 GHz)   Mac OS X (10.4.6)   768 MB RAM, on-board sound card

Problem solved itself after a few hours of, well, being on, and used. Don't know what started it, don't know what ended it. Any theories? Anyone else had this happen to them?

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