The image of my Macbook Pro is upside down when projected through a LCD projector.  This isn't a problem of projector.  How can I fix it?

When my new tri - LCD projectors installed office, they have been installed backwards so all images have been reversed.  Colleagues using Windows said they were able to operate their output with a few keystrokes, and somebody found one for my Macbook Pro (13-inch with screen Retina, end of 2012).  It wasn't so much a combination of keys, but a couple of dialog boxes have been opened and clicked a few things.  But it worked.

Now, the spotlight have been rectified and colleagues using Windows have retoggled their laptops but can't remember how to reset my Macbook.  I think it's in the system preferences and screens, but I can't find anything either and link on the internet.  Help, please.

Please press and hold the command-option key combination while clicking on the icon in the System Preferences window displays.

ATTENTION: On some models, display rotation may cause the screen to go black. You can force a restart to recover.

Tags: Notebooks

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