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I have an HP LP3065 display and a few days ago upon returning to the computer (others in the family probably had used is between my sessions) I noticed that all the colors seemed a bit subdued. This is not the case for the MacBook Air's built in screen. I am running OS X Lion. It is almost as if there was a slider between black and white and color and someone moved it closer to black and white. Could this be due to a software setting on my Mac? Or perhaps it is a hardware setting on the display? There are plus and minus buttons on the display but pressing them seems to do nothing.

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Have you checked to see if the Color Profile settings have changed? Go to System Preferences, Displays, Color. Try choosing a different profile, if one isn't available for your specific monitor.

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I had checked, nothing appeared changed to me. – WilliamKF Sep 15 '12 at 0:51

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