“If I don't connect my power supply for my apple Powerbook pro M1, will my external monitor work as the main monitor when I close the lid?”
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In order to close an Apple computer lid and continue to use an external display, also known as closed-clamshell mode, you must connect an OEM power adapter and an external keyboard and mouse or trackpad, either USB or wireless. For more information, on using your Apple computer in closed-clamshell mode, please visit the Apple Support page. Thank you.
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