No MPEG1 sound on my iMac G5

Help. For some reason my old clips that use MPEG1 Muxed (sound) now have NO sound. I have isolated it to this modem type as all other file formats, including windows formats play okay in QT.
Also, MS Word no longer beeps or makes other prompting type sounds.
Also, MovieMagic Screenwriter no longer produces any sound when saving, detecting spelling errors, etc.
which I mainly use for streaming radio staions, as most only support Realmedia or Windows streaming. Video is okay, just no sound. This also includes no sound when watching or listening to anything from Youtube.
I was running 10.4.8 from the software update and everything was fine. I downloaded Audacity this morning, opened it, did nothing with it and then closed it. Possibly the problems started at that point but I'm not sure. I have since downloaded and re-installed 10.4.8 using the combo 10.4.8 version according to the apple guidlelines, but there is no change.
Everything was working fine, and always has, now I suddenly have all of these problems with sound. Never had this before ever. Also downloaded the latest version of QT pro again, but no difference detected.
iTtunes works okay and so do all of the OSX alert sounds as well as my clock. Later QT movies that use the newer codecs also work okay.
Please, can anyone help? The problem is on my iMac G5, 20 in, 2GHz.
Thankyou.

Audacity is a program that has been known to change sound MIDI prefs and if it does that, the sounds on your Mac can disappear.
To fix it, simply open up Garage Band and play a sample loop. This will reset the prefs to the defaults and if that was the problem, your sound will return.
Apple has a KB article about it HERE.

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