I have a Dell B110 home pc and my color on the screen went haywire and I need to know how to restore the color?

A couple weeks ago my pc color got messed up somehow and I can't find my user manuals and my warranty has run out. I need to know how to go in and reset this so I can restore the color. I used the buttons for contrast and shade but it is all shades of grey or blue, can someone help me?
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