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Something has happened to your video driver. Since you're using OS9, open the Extensions Manager and scroll through the list of both Control Panels and Extensions, looking for things that might should be on but aren't. Reboot and see if it's back to normal.
If not, figure out what kind of video card you have (System Profiler can do this) and go to the vendor website (eg ati.com) and see if you can download drivers for OS9.
Good luck!
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