This is a fix for the unusable noisy audio output on the G5's. I personally like having the computer audio out available to play Itunes or webstuff without taking over my Digi hardware ....... Go to http://developer.apple.com/tools/download/
__ Download and install CHUD.___Once it's installed, go to your hard drive>Developer>Extras>PreferencePanes.... Double click and install the processor preference. It will install and open up your system preferences ..... all you have to do is uncheck "allow nap" and voilà the noise goes away!