My 2009 iMac screen looks like a picture negative - how do I reset it to the normal screen?

Yesterday my 2009 (maybe2008?) iMac screen switched over to look like a negative.  How do I reset it?  Do I have a virus or something?

Hi...
Open System Preferences > Universal Access > Seeing
Check your Display settings.
Doubtful it's a virus. Sounds more like you have "white on black" or "grayscale" selected.

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