Display changes color mode after restart.

I recently turned off my computer for a couple days and when I restarted my iMac screen is displaying in a strange color mode. It looks like the contrast is turned up and the color depth is in 256 color mode. I've gone into the preferences and tried about eveything I can think of but nothing switches it back to normal.
When I restart, everything goes back to normal for about 3 seconds and then it switches back to this strange display settings again.
I'm stumped, any help would be appreciated.
17" iMac 800 mhz   Mac OS X (10.3.9)  

Check the settings in Apple menu > System Preferences...> Universal Access > Seeing. 
cheers
mrtotes

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