G4 Display screen issue - need assistance

Have an iBook G4. Daughter uses it for school. Cat fell asleep on the key board and when she came back the screen reads in reverse (as I type I see white letters on a black screen vs. a white background with black type. Weird!

Any one know how to flip it back to normal viewing? I have powered down and restarted in hopes that it would revert back to existing settings but it did not.

Thanks in advance for recommendations.

Tom

Perrrrrrrrfect

Thanks for the guidance! We are now cat proof on at least this cat sitting issue if it happens again. We appreciate your help Joe.
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Tom::