No sound on MPEG1 muxed files.

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.
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.
Also, Real media player no longer produces sound, mainly used for streaming radio staions, as most only support Realmedia or Windows streaming. Video os 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.
Please, can anyone help? The problem is on my iMac G5, 20 in, 2GHz.

Hey Ham
try this
Go to the "Get Info" by right clicking on the song and from there go to "options" and see what the volume preset is on

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