[ubuntu] ubuntu 12.04.1: flash videos in youtube won't play

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http://ubuntuforums.org – Hello, I ve installed ubuntu 12.04.1 on my pc, (athlon xp 2200 - ATI Radeon 9800) and when I go to YouTube with Firefox, the videos won't play... they load, but all I get is a black screen. The same happens when I navigate facebook, the embedded videos won't play. the flash player plugin is installed, and also shockwave flash... what could be wrong? Thank you, I am new to this operating system and need to learn many things... :frown: Bambee (Hardware)