Suddenly black background display

I have a G4 that is set to a blue background, but is now displaying a black background with white type. Any photos displayed against this background look like color negatives. We've established that no one in the household has fooled around with the settings. When we turn the computer on, it briefly (for a second or so) displays the typical blue background but then jumps over to black.
Diagnosis? Any help appeciated.
PowerMac 4.5   Mac OS X (10.4)  

cd2004, welcome to Apple Discussion.
Someone hit some keys wrong. Simple fix at http://docs.info.apple.com/article.html?artnum=107329
 Cheers, Tom

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