Why can't I load youtube videos with FireFox 4.o beta

Somehow or I don't know I can't load youtube videos, I can access the youtube page and pick a video normaly but when it's time for the video to load it won't ! the video screen will just stay in color balck ! I tried erasing the cookies and rebooting my laptop but nothing works !
I have windows 7 Ultimate with Firefox 4.0 beta everything is upgraded properly HELP !

Clear the cache and the cookies from sites that cause problems.
* "Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
* "Remove the Cookies" from sites causing problems: Tools > Options > Privacy > Cookies: "Show Cookies"
You can try to disable the hardware acceleration in the Flash Player.<br />
See [[Cannot view full screen Flash videos]]
* http://www.youtube.com/swf_test.html (right-click the player: Settings)
Flash "Display settings" window:
* http://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html

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