recently i cant watch videos for example on youtube in full screen mode. i dunno wat is de prob. i tried everything mentioned in the trobleshoot but nothingseems to work. when in small normal mode i can see de pic but in full screen mode i cant see any pic except a black screen but i can hear the sound. plz help me solve this problem as it is very disturbing. even a game from facebook called farmville i cant even view that in full screen mode. i tries in other browser like google chrome also have this problem. == This happened == Every time Firefox opened == i am not quite sure since this month i guess.