Apple Site Videos appear black, but auido OK

I don't know what's going on. This is a new iMac (purchased from apple Sept '07)
It was working fine for while, now when I try to watch ANY video on apples site, the video is black and the audio is fine. (this includes tutorials, guides, and ads)
I've tried using safari, and firefox, I've rebooted the computer and check some settings. Can any one help?

Yes, I've installed all the quicktime updates. (even 7.4) That may have cause the problem. Maybe it's only quicktime videos on Apples site that I'm having a problem with. (Most other sites are using flash based players)
I don't want to do a full system refresh (besides being a mac newbie, that's more work) is there another way around it. I don't mind removing quicktime, finding older versions and trying that. Do you think that might work. Even by removing some of the system library files. (I may be a mac newbie, but I was an advance PC guy for years, that finally got tired of all the garbage and just wanted something that worked.)
Thanks

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Apple Site Videos appear black, but auido OK

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