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#MAC TO TV FOR VIDEO DIPLAY FOR CHALKBOARD MAC OS X#

These are the keys to press and hold simultaneously on the MacBook Pro / Air keyboard to reset the SMC:

Using the built-in keyboard on the MacBook, press and hold down the Shift+Control+Option+Power buttons at the same time (see the image below for details) and hold them for about 2 seconds, then release all keys together.

Connect the MagSafe power adapter to the MacBook.

Shut down the Mac so that it is turned OFF (not sleeping).

Disconnect the external display from the Mac.

You can find details for SMC resets on other Macs here, and Apple has directions for other machines here too. This is how you reset the SMC on a portable Mac that has a built-in battery (not a removable battery), like a MacBook Air, or new MacBook Pro with Retina display. Resolve Monitor Flickers by Resetting the System Management Controller of a Mac

Fortunately, a simple SMC reset resolved the problem completely on both Macs, and external displays again worked as they should post-SMC reset. That’s good news, because that also means the problem was likely not to be simultaneous concurrent hardware failure – a truly rare event that would be even moreso with two unrelated machines failing side by side.

#MAC TO TV FOR VIDEO DIPLAY FOR CHALKBOARD MAC OS X#

(Excuse the vertical video formatting, someone didn’t follow this important advice for recording with the iPhone camera!)īecause each of the Macs behaved perfectly normal with external displays prior to the Mac OS X update, and the problem spans between two totally different Macs and with different connection types and even monitor brands, this suggests something went awry during the upgrade process.