[ubuntu] Problem with changing display in Ubuntu 9.1

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http://ubuntuforums.org – So, I start Ubuntu on my laptop, then I plug in my external monitor and I go to preferences and click on display to change the screen from laptop io the external one, just as I click on display, the laptop screen goes dark, only I see the mouse pointer, and nothing on the external screen. If I turn on the computer with the external display plugged in, everything works fine. Anyone else has such a problem? (Hardware)