Video Won't Go Full Screen?
Have you recently tried to watch a Youtube video full screen, but when you click on the full screen button on the bottom right of the Youtube video it just goes full screen but is all black? You can hear music but no video? It may not be a driver problem or an outdated version of flash.
The solution may be just as easy as right mouse clicking on the video- This should bring up your Adobe Flash Player Settings-On the "Display" setting -uncheck the box titled "enable hardware acceleration ". Now check and see if you can go full screen on the video.