Mac Freezing when watching fullscreen videos

Hello,
Whenever I watch a flash movie (like Youtube) and set it to fullscreen my mac's screen freezes. I can still hear the movie's audio (that is playing) but can't do anything (not even use Force Quit). I can sometimes move my mouse around but no matter what i do (click, drag, etc) the computer does not respond. Some seconds later, the computer automatically log's out and i'm in the login window (and at this point i can use my mac normally).
Can someone please help me solve this problem?
Thanks

Ok...
Try emptying the Safari cache. From your Safari menu bar, Safari / Empty cache or Command + Option + E on your keyboard. Restart your Mac.
Try a video.. If it still freezes, login to another user account on your Mac. Try Safari there.
If videos freeze there, that can be an indication that the startup disk needs repairing especially since you mentioned this: *I can sometimes move my mouse around but no matter what i do (click, drag, etc) the computer does not respond.*
Follow the instructions here for Using Disk Utility to Verify or Repair Disks
Message was edited by: Carolyn

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