I own a year old iMac G5 (1.25gb RAM, 80gb HD, 1.8gb processor) and my problem is that I can't hear any audio on particular websites (ie. youtube, angryalien, abcnews), but I can hear the audio on other sites. I have Quicktime player, windows media player. I just reinstalled Macromedia Flash Player and restarted, but nothing changed for the better.