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Since a few days, i have a limited Screen resolution, resulting in a black bar on the top and the bottom of the screen. When starting up in safe-boot, there is no prolbem. The display dialog let's me select the correct resolution 1920x1200, but beneath ther is written "Usable resolution 1920 x 1080"

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    What sort of monitor do you have, and what kind of cable connects it to the Mac?
    – Cajunluke
    Dec 24, 2010 at 18:28

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The reason are two displays (one tv) with "mirror displays" ticked.

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