Ok so here's my issue. My sound sometimes doesn't work and here's what I mean. If I'm using itunes, or windows media player my audio works just fine all the time, however if I'm online and an audio/video clips loads that isn't windows media or quicktime format, I cannot hear the sound. I have also noticed that my sound/volume controll icon doesn't appear on my taskbar even though I have checked the box in options so that it should. Any suggestions?