If you are using an adapter in your external display setup that is connected to your displays via HDMI/USB-C connectors, sometimes removing all the cables including HDMI, USB-C and ethernet cable, etc and then reconnecting everything can overcome this issue. External Display Flickering/blinking issues with macOS Catalina In the case of external display issues with your Mac, it’s also a good idea to check out the resolution and Refresh rate parameters.Ĭlick on > System Preferences > Display and use 1024×768 as a start.
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