HT201364 since I updated my system to Mavericks my computer colour is always grey. I have tried to change the colour via system preference without any success. What should I do to so that my screen will be colourful?

since I updated my system to Mavericks my computer colour is always grey. I have tried to change the colour via system preference without any success. What should I do to so that my screen will be colourful?

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