:) Amazing, this worked for me with Mac OS X 3.9

After Firefox 2.0 crashed - it or none of my other browsers would play audio from embeded media sites. Set output to 44100 Hz and all is well...

I am also using Detour and Audio Hijack Pro - AHP would show that signal was being processed, but no audio would play through speakers before the fix...

Thanks!:cool:

GarageBand voodo fix didn't work for me. Audio MIDI was set correctly, so that was no help.

Trashing my Macromedia preferences finally did the trick. YouTube audio has been restored. Thanks, all!

did not work for me, until I moved the volume slider in the output channel 1 by a notch

Dude, that's a brilliant fix! I tried just about everything else I could find and then I read your post and did it and now BAM! I can hear YouTube again. Which is REALLY important when you're watching videos like this: http://ca.youtube.com/watch?v=lk5_OSsawz4

Thanks so much for sharing that!

The Fix
 

I too have a G5 and experienced the same "No Sound" problem coming from any Flash Video on a web site... I did all of the suggested fixes with no luck... However, "The Voodoo fix of launching and then quitting Garage Band" WORKED. I'm not asking any more questions... it just worked...