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Macbook - problems to connect w external screen

I do a lot of presentations (Keynote) from Mac to external screens at events.

The new MacBook (12") is quite often having problems so I have to carry a MacBookAir as a back-up just in case.

Problems can be everything from no image at all, image with spikes and even two images (like 70% Keynote + 30% desktop).

It doesn't matter if I use HDMI or VGA. And yes, I know how to adjust resolution in settings 🙂 Sometimes the problem is fixed by adjusting the resolution manually, but then the Macbook can jump back to the resolution that doesn't work by itself during the slideshow...

I believe the problem only occurs when I have to go through a device like a split or when there is lots of tech back stage.

Anyone else having problems like this with the MacBook?

Any ideas on whats wrong and how to solve it?

MacBook (Retina, 12-inch, Early 2015), OS X El Capitan (10.11.3)

Posted on Mar 21, 2016 1:53 AM

66 replies

Dec 10, 2016 10:16 AM in response to stefanfromingarö

I have the same problem. I have had it since day 1 on my MacBook (Retina, 12-inch, Early 2015). have tried multiple monitors and multiple dongles. It's definitely the macbooks usb-c port.

Dec 18, 2016 4:50 AM in response to stefanfromingarö

Finally!

The update to 10.12.2 fixed the problem.

The external monitor is stable now.

Feb 16, 2017 1:00 AM in response to Tevje

I have the exact same problem even when the monitor is connected using usb-c. If the machine goes to sleep or if I disconnect and then reconnect the monitor, it looses resolution. Driving me crazy!