Mac OS X Version 10.6.8  videos are black on all websites

Does anyone know what I can check to figure out why all videos are just black.  Can no longer play videos -- on any website or youtube.  Used to work fine.  Is there a setting maybe that was accidentally turned off from the keyboard? Any suggestions? Thanks!

Thanks mate but Software update is indicating that I am all up to date.
I have booted off an older clone and mail was fine. I may have to go for a fresh install of the system but it annoys me to have to do that. It's gotta be something simple!

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