Mac book pro not driving monitor when on battery
mid 2010 MBP with ML 10.8.2 (latest updates applied)will not drive an external monitor when on battery. Have checked the monitor settings and they are fine, have disabled all power saving.
When open it drives the external monitor as well as the MBP screen. However the background on the MBP screen is grey rather than showing the background image.
Any ideas?
tested on two different monitors and it was the same on each. I forgot to mention that this functions perfectly on a mid 2012 MBP on both monitors.
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