The color problems  of I mac

when it starts, it's normal color like before.
But After the booting, the color of monitor changed.
No Grey color.
it looks like posterized.
I checked all setting of display but It's ok.
I heard that's not hardware problem because when it started, it was normal color.
What do i have to do? do i have format?

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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