IMac screen looks like a color negative

Just recently, my screen on my iMac G4 has changed. When the computer is booted up, everything is black & white, but like a negative (what's supposed to be black is white and what's supposed to be white is black). If I go into the display settings, it's set on 256 colors. If I change it to millions, then the screen just changes to what looks like a color negative (same with black & white, but blues are orange, greens are purple, and so on). And if I reboot, it starts all over again. So far nothing else seems to be affected and all programs seem to work fine, just the colors are off.
I've look through all the settings and can't find anyway to change this and don't know what might have caused it. Any help would be appreciated.
iMac G4   Mac OS X (10.2.x)  

Hello David and welcome to discussions,
Try this...
Hold down, at the same time...
Control Option 
then hit 8
This also toggles the effect. It can also be found in system preferences > Universal access.
Hope that helps some
Regards
Ian

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