Problem with dual monitor 30" and 20"

waaa... i've switched plugs and all that.. my 30" is acting as a second monitor no matter what i do...
i want the 30" as my main display...
my dock and menus are on my 20"
is there a way to switch them? or do they not support dual monitor with a 30"
for your info..
video card is nvidia geforce 7300 gt
please help.. i don't want to give this bad boy to someone else at work.
thanks.
Pave

How?

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Problem with dual monitors - unresponsiveness and shut down

Hello there!
I've been happily using a 2010 Mac Pro since March with a Radeon 5870 card and two Apple displays connected to the card with mini-displayport cables.
Recently, after I installed Lion, the secondary screen has been acting strangely; sometimes, while I can move my cursor without any problem on it, I can't click on anything. I click and the program, such as Apple Mail or Reason, just doesn't respond in any way. Moving the program window to the main screen solves the problem.
Moreover the secondary monitor sometimes shuts down for a second, displacing in the meantime all my windows to the main one. It always comes back instantly.
Finally, when I use Windows 7 the secondary screen isn't even recognized anymore; it stays black and windows doesn't see it.
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There ARE problems hooking up multiple DVI displays. But Mini DisplayPort displays are supposed to "just work" according to this article:
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If I may jump in, I have almost the same question and would like to clarify the Cmd-F1 suggestion. (I'm looking at buying the 24" LED for my slightly older MBP with max resolution 1440x900.) If one runs this monitor in extended desktop mode, you can reach the max resolution for the monitor, if I understand correctly, but is some of your "desktop" then spread across your built-in MBP LCD? That's less useful than having the entire 24" available for keeping multiple windows open.
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Problem with dual monitor 30" and 20"

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