Negative display!

Somehow I've managed to change my display to negative, so the screen's black and everything else is the reverse of how it should be!
I must have pressed some sort of key combination - I think I was trying to get a symbol by using control/alt...
I can't get it back to normal - when I restart, it comes up normal for a while, then just switches to negative when the restart process finishes..
Any ideas anyone?!?!
Cheers!
Mac G4 1.25GHz Mac OS X (10.4.7)

Not to worry - a quick search for 'negative display' produced results to solve my problem (control-al-option-8 did the trick!)

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Message was edited by:
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