Desktop suddenly appears as a photographic negative

I have been a mac user since 1985, but have never run into this problem before. I have an iMac G3 PowerPC 750 600 MHz, running OSX 10.3.9. When I "woke" my sleeping desktop this morning, it appeared in mustard yellow, even though it is set as "aqua blue." Everything appears as a photo negative, whites are black, blacks are white, etc. I ran Virex; I restarted; I shutdown and restarted. I checked all my preference settings. I tried printing a photo from iPhoto (it looked like an old film negative), and the printed version came out in normal colors. I haven't found any references to this problem elsewhere. It's very disconcerting to work in the negative, and I would appreciate any help restoring my desktop to sanity as soon as possible.
iMac G3 PowerPC 750 600 MHz   Mac OS X (10.3.9)  

collegemom --
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