G4 display is suddenly negative black and white image...

As I run out to work, I notice this strange appearance on the monitor. Negative black and white for everything on the monitor. Does anyone know what causes this or how to switch back to normal?
Power Mac G4   Mac OS X (10.2.x)  
Power Mac G4    

Hello Frank and welcome to discussions,
Try this key stroke...
Hold down the Control Option Apple keys then hit 8. This will toggle the effect as well.
Control + Option + Apple then hit 8.
Hope that helps some
Cheers
Ian

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