IMAC Screen Colors "Wrong"

Quite suddenly, my 2007 IMAC screen started displaying "toothpaste green" instead of white and the background colors have a lot of red in place of what?  Seems that the overall palette might be off.  I tried the calibration routine, but didn't change back to anything like it was.  The Log-on screen seems the same as it ever was, just after I log on are the colors all wrong.  This is true for the other two users on the machine as well.  Help!?

Open the Universal Access pane of System Preferences, click on the Seeing tab, turn off White on Black, and drag the Contrast slider all the way to the left.
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