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Problem with my IMac

I already unplug the imac display and using other monitor as the display, but why i cannot make it as the main monitor..

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Want to try that again?

In reply to: Problem with my IMac

Want to try that again? I'm not following what it is you're trying to do.

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I think he needs to turn off extended desktop

In reply to: Want to try that again?

Go to system preference
click on mirror display

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Change primary display, without mirroring!

In reply to: Problem with my IMac

If you want to make your external display the primary and your imac display the extended (not mirror) what you can do is:

1) Open system preferences
2) Click on "display"
3) Select "Arrangement"
4) One of the displays will have a white rectangle on the top of the screen. ( it's your primary display and the white rectangle represent the Apple Menubar), drag the menu bar on the display you want as Primary.

Done! You can now use your external display and put your iMac monitor on the side.

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