i have hdmi from mac to tv but i have no picture only sound

You would be surprised how removing all the cables and reconnecting everything can sometimes clear up any external display issues you may be experiencing.įor details around setup and troubleshooting external devices, you can read through the suggestions in this Apple white paper. 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. Repairs any directory issues, if possible.Deletes font caches, kernel cache, and other system cache files.Safe mode performs certain checks and prevents startup items and login items from opening automatically Starting your Mac in safe mode does the following: 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. General troubleshooting tips would include checking the following:īlack Screen on External Display with macOS Catalina.External Display Flickering/blinking issues with macOS Catalina.Black Screen on External Display with macOS Catalina.

I have hdmi from mac to tv but i have no picture only sound