Monitor turns negative or overexposed

My older Powerbook, suddenly developed a problem with the built in display. All functions normal until I log in, within a few seconds the screen turns negative or over exposed. If I log out all is normal and if I log in as another user, the monitor function normal again. The problem only pursists while logged in as administrator so has to be a software problem. The computer functions perfectly normal, with a negative dsplay.
I've checked to monitor settings. All are normal. Expose is disabbled and screen saver set normal. Virus maybe? I'm stumped. Help?

Thanks guys. I never ever go to universal access and missed that one. ...My baby daughter uses my old mac and sometime when she doesnt' like something she banks on the key board with both hands. She must have hit control/option/command with her left and 8 with her right. Thanks guys for your knowledge and time.

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