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Helpful answers
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Jun 3, 2015 7:17 PM in response to jbrooks92by rkaufmann87,Have you opened System Preferences - Displays and seen if the external display is "seen?" Please carefully read Apple's OS X: How to use multiple displays with your Mac in Mountain Lion and earlier - Apple Support
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Jun 3, 2015 7:42 PM in response to rkaufmann87by jbrooks92,I've gone into preferences and displays. It shows me two boxes one with a border on top. I've unclicked the mirror display. And move the the second box to the the placement of the second monitor. However, no image appears. I can move my mouse to where the second monitor should show it. But there is nothing.
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Jun 3, 2015 9:26 PM in response to jbrooks92by rkaufmann87,I'm not sure what you are doing wrong but you are, I'd recommend speaking to a Genius at an Apple Store that can solve the problem. Either that or you can call AppleCare, the call will not be free unless you have AppleCare but the Genius visit would be.
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Jun 5, 2015 8:23 AM in response to rkaufmann87by jbrooks92,Thanks for input. However, I've tried two different mini display port to DVI adapters, two different DVI cables and two different HP monitors, all of which work. So it's got to be the LG monitor specifically. I don't know if there is a way to get the LG monitor to work. But it doesn't currently work.