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When I connect my macbook air (2012 early I think) to a DELL U24-something display through a DVI the colors on the display are really weired: it is like all the colors are really desaturated and low-contrast and some selected colors are very saturated and strong.

I tried changing color profile but then it only got worse.. when I have a Windows PC connected the colors look great.

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Have you tried changing the contrast, colors and saturation on the screen itself? – Emil Feb 14 '13 at 19:37
@Emil I don't want to because it works great with windows – ilyo Feb 14 '13 at 19:45
Are you using the same cable in both cases? Your cable or Mini DisplayPort to DVI adapter could be damaged. – maseth Feb 14 '13 at 20:34

Every time I have had a color problem with an external monitor the problem was caused by a loose/bad connection between the display's cable the and display adapter dongle on my Mac. Make sure the cable is firmly and completely seated inside the port on the dongle.

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