I can no longer play videos on my Mac mini.

I got a new magic mouse for Christmas. I connected it to my Mac mini Lion. It works great but I can no
longer play videos like from YouTube. I just see a black screen. Even the start triangle does not show up.
This is date coincident with installing the new mouse.
Does anybody have a clue what is going on here?
Thanks in advance.

The Magic Mouse and YouTube videos don't have anything to do with each other. I switch between my Magic Mouse and my track pad all day, and it has no effect on YouTube.
YouTube playback is browser and Flash Player related.
Check your Safari Security preferences to be sure that Plugins are allowed.
Worst case, do a "clean Install" of Flash Player. Instructions (with illustrations) are here: http://forums.adobe.com/thread/1343084

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