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If your startup disk is encrypted with FileVault, you might need to log in twice: once to unlock the startup disk and again to log in to Finder.

To exit safe mode, restart your Mac without pressing any keys during startup.

Release the Shift key when you see the login window.

Restart your Mac and immediately press the SHIFT KEY.

If that didn’t help, try resetting your Mac’s cache by starting up in Safe mode Use either shift key to boot into Safe Mode This should take care of the black screen issue on the external display.

Enable the Display Driver here in these privacy settings.

Choose Screen Recording on the left panel of the screenĮnable your Display driver for privacy here.

It appears that in order to tackle the black screen issue on the external display, you have to change a ‘Privacy’ setting. Black Screen on External Display with macOS Catalina

Follow these tips if you’ve got printer problems with macOS CatalinaĪnother issue reported by some users is that the external display blinks randomly when connected to the MacBook running macOS Catalina.

How to Use An External GPU With Apps on Your Mac Computer.

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Several users have found that when they connect their MacBook to an external display, the screen simply turns black on the display and eventually shuts off. MacOS Catalina upgrade, released recently has seen its fair share of technical glitches. One such issue centers on using external displays with macOS Catalina.