Connect second external screen to MacBook Pro mid-2012? - Tech Support - MPU Talk
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MacBook Pro 16” Users that still have the external monitor issue-Can you please try this and tell me if it fixes it-Connect on the right side of USBC the power adapter and
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Use your iMac as a display with target display mode - Apple Support
Fixes for External Display Not Working on MacBook | by Julia Tsoi | Mac O'Clock | Medium