"If the display image is blank or unusable" Get help with video issues on external displays connected to your Mac If the issue continues after updating your software and apps, follow the steps outlined in the two links below (each to a different section of the same article). Here are some guides to follow for these steps, just in case: We encourage you to back up your Mac prior to updating too. Be sure to update your apps after updating macOS. There's an available macOS update that you'll want to install to see if that helps. To rule that out as a possible culprit, do you have another to test with? Does this happen when waking your MacBook Pro from sleep or while using your Mac? If while using it, does it happen when using a particular app or completing a certain task? You also mention the cable. Thanks for using Apple Support Communities! it sounds like you're having an issue with the display on your external display intermittently showing a black screen with the cursor.
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