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why does macbook's monitor stays on when clamshell is closed

85 Views 0 Replies Latest reply: Nov 26, 2012 6:38 AM by Donavan1951 RSS
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Nov 26, 2012 6:38 AM

Just traded my iMac (2007) for MacBook (2009). I've installed my purchased Mountain Lion OS. I did not check to see if the clamshell on-off switch before trading. I am trying to use my external monitor for the main display. Is there a known issue with ML in MacBook?

MacBook, OS X Mountain Lion (10.8.2), Serial Number W8912HVK4R1

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