Audio disappears completely

I have had problems with all audio disappearing when running VLC. Today, I was listening to iTunes and started VLC, which killed all the audio. The error message from VLC is "audio-device var does not exist. Device probe failed."
If I try to open the sound system preference, sound preferences crash. If I try iTunes, it gives no error message, but the progress bar does not move and nothing happens. The audio output is connected to an audio amplifier by optical cable. Rebooting fixes the problem.
Does anyone have an idea if this could be a hardware problem?
Mac Mini Mac OS X (10.4.5)
PowerMac G5 Mac OS X (10.4.8)
PowerMac G5   Mac OS X (10.4.8)  

Many thanks, DaddyPaycheck. No, I had not seen it. I assume I will need to reboot for it to take effect, but, since I can't do that right now, I'll have to wait and hope that it works. Thanks again.
PowerMac G5 Mac OS X (10.4.8)

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