All of a sudden my mac won't play videos. If I go to youtube, all I see is a black square where the video and control buttons would normally be. The videos people post onFoo, same thing. I see a black square and that's it. There's no button to push play, pause or anything else. Both firefox and safari do the same thing. I aso recently downloaded google chrome and that doesn't work either. When I go to youtube, I type in the search window and I don't even see the letters being typed, but when I hit enter, the url at the top changes to reflect the video I want to see, but it never goes to that page.
Does anyone have an idea what might be wrong?