We’ve also found that if you’re using your power adapter via the adapter, simply unplugging the power adapter from the dongle and reinserting it, or using the power on an alternative Thunderbolt port seems to clear up image issues. Then plug the adapter in first, then attach the monitor. So unplug the adapter from the Mac, and then the monitor from the adapter. ![]() Most important seems to be power-cycling the adapter. We’ve seen some strange flicker and “crawling” screen pixels when using an external monitor with a Mac, and one reliable fix is to plug the various components in using a specific sequence. RELATED: Everything You Need to Run Multiple Monitors from Your M1 MacBook Try Different Plug-in Sequences You can try borrowing a different adapter to see if this resolved the issue or check with the manufacturer to see if there’s a firmware update or other fix available for known issues. This works fine in general, but if you’re experiencing screen flicker, it might be down to problems with your HDMI or DisplayPort dongle. Most modern Macs have a paucity of ports, relying on a handful of Thunderbolt ports and adapters to connect peripherals.
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