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Multi monitor issue

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Hi all,


Im using a Dell XPS L701x with Lion 10.7.4 and almost everything is working except one important thing. Currently I use 2 external displays, (dell 22" and dell 23"). The laptop has 2 video outputs, HDMI and Displayport (video card = gt445m). When I plug in one external monitor os x recognizes 2 monitors (laptop display and the external monitor) but when I plug in another external display then os x only recognizes the laptop display. (In windows I can select wich 2 displays are enabled and with one is off). Is this also possible in os x lion?

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