I have a G5 that is running OS 10.5.8. There is no sound when a video is playing in a browser, for example Utube, GoogleVideo, etc. That is so with all the browsers - Safari, Firefox, Navigator, Wyzo, etc. However the sound does play when playing a video under a normal video player - QuickTime Player, VLC, RealPlayer, etc. Anyone have any suggestions?
Whenever this happens to me, I discover that I have muted the sound, or maybe it gets reset without my input, but I just hit the volume increase key and it comes back. Hope it's that simple!