If your Mac doesn’t work with external monitors with the lid closed, the fix is deceptively simple, even though it’s maddening.
Check your power connector. A Macbook or other portable Mac won’t work in closed-display mode without AC power.

David Farquhar is a computer security professional, entrepreneur, and author. He has written professionally about computers since 1991, so he was writing about retro computers when they were still new. He has been working in IT professionally since 1994 and has specialized in vulnerability management since 2013. He holds Security+ and CISSP certifications. Today he blogs five times a week, mostly about retro computers and retro gaming covering the time period from 1975 to 2000.










