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I cannot watch anything on youtube, the screen is totally black

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I enter on youtube, find whatever I want but I cannot watch anything, the screen is totally black with ni buttons of play or pause etc. underneath. (I can watch everything from internmet explorer).

I enter on youtube, find whatever I want but I cannot watch anything, the screen is totally black with ni buttons of play or pause etc. underneath. (I can watch everything from internmet explorer).

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Try to disable the hardware acceleration in the Flash Player.
See Flash videos won't play full screen

Flash "Display settings" window: