Browsers won't play sound when playing audio

Everything was working fine with my iMac until some time today. I have the standard iMac and an Edirol FA-66 Firewire audio capture.
At some point today, the Mac decided that it was going to send all of the sound streaming through my web browsers (Safari and Firefox) to the Edirol. Everything else - iTunes and so on - plays fine through the iMac speakers.
I have been into System Preferences and the Audio menu and made sure that the output is selected to built-in speakers.
I have shut down the computer and unplugged the Edirol. When I reboot the browsers simply produce no output. I know they are still playing the audio because I can capture it with software like Audio Hijack.
When I reconnect the Edirol, the audio plays through that.
It would seem that some piece of software has possibly hijacked the audio from the browsers and is overriding System Preferences to send the audio to the Edirol (or nothing, when the Edirol isn't plugged in) but I have no idea what that software is.
I have recently installed the MPlayer and a Quicktime plugin to play AVI files but that was a couple of days ago and things worked fine with the browers afterwards.
iMac G5 Mac OS X (10.4.4)

Hello,
You might try launching Garage Band and play a few notes in there. Then, close it and see how things sound.
Garage Band restores many sound settings to their original settings. So, while I've never used it for this particular symptom, it couldn't hurt to try it.
Also, there are additional audio settings in the utility "Audio MIDI Setup" in the Applications --> Utilities folder on your hard drive. So, you might check your settings in there as well.
I hope this helps.
Let us know if you have other questions.
P.S., if you'd like, go ahead and click the "Helpful" or "Solved" buttons on any of the posts / replies above if you feel they were helpful or adequately answered your question.

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Browsers won't play sound when playing audio

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