0 Replies Latest reply: Nov 26, 2012 6:38 AM by Donavan1951
Donavan1951 Level 1 (0 points)

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