![]() Now press the Power button on the keyboard to boot the Mac as usual.When that is finished, boot the Mac and reconnect the display: 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. See the Apple Support article Connect a display to your Mac.(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. See Connect a display, TV, or projector to Mac.įor Mac computers with Thunderbolt 4 (USB-C) and HDMI ports: You can connect up to four external displays to your Mac, depending on your Mac model. A DisplayPort device must be the last device in a chain of connected Thunderbolt devices. ![]() If your Mac has two Thunderbolt ports, you can connect each display to separate Thunderbolt ports on your Mac. If the displays themselves have Thunderbolt ports, you can connect one display to another, and then connect one of the displays to a Thunderbolt port on your Mac. If your Thunderbolt 3 display has USB ports, those can be used for data and power.įor Mac computers with Mini DisplayPort, Thunderbolt, or Thunderbolt 2: You can connect up to two displays. If you connect multiple Thunderbolt devices to each other, the Thunderbolt 3 display must be the last device in the chain. See the Apple Support article Mac computers with Apple silicon.įor Mac computers with Thunderbolt 3 (USB-C): You can connect a single display to each port. On a Mac mini with M1 chip, you can connect a second display to the HDMI port. Docks don’t increase the number of displays you can connect. You can connect one or more external displays, depending on your Mac.įor Mac computers with the Apple M1 Chip: You can connect a single external display to your Mac. Connect a wireless keyboard, mouse, or trackpadįor each display, securely connect a video cable (and adapter, if necessary) from a video output port on your Mac to the video input port on the display.Get started with accessibility features.Use Sign in with Apple for apps and websites.Manage cookies and other website data in Safari.View Apple subscriptions for your family.Subscribe to podcast shows and channels.Sync music, books, and more between devices.Send files between devices with AirDrop.Make and receive phone calls on your Mac.Insert photos and documents from iPhone or iPad.Use a keyboard and mouse or trackpad across devices.Use Continuity to work across Apple devices.Use SharePlay to watch and listen together.Use Live Text to interact with text in a photo.Make it easier to see what’s on the screen.Change the picture for you or others in apps.Install and reinstall apps from the App Store.
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