Just got me my first Apple computer, a high end early 2011 15" MBP and I love it. However, I've run into a problem. No streaming video seem to work when the discreet graphics card is activated. Any youtube video, for instance, just play the sound while the window for video is empty, allowing me to see my desktop background image behind it. There's no problem when running the integrated graphics. I've updated the OS to the latest build but that didn't resolve the problem. Anyone here knows what to do? I've tried to mroogle, but can't seem to find a solution. 