and concentrate on System Preferences > Universal Access.
You'll probably find that your cat managed to turn on one of the options in there. They can be triggered by a combination key press.
Check the Vision section first
BTW, did not find the Mac forums to post this in? They are at http://forums.cnet.com/mac-forums/
I'm a Mac Newbie and my cat jumped on my computer and now it's in sepia and negative. How do I change back to normal? I'll need a walk through colorsync utility, at least I've gotten that far lol