how to turn on macbook in clamshell mode

It periodically checks if lid is closed and puts machine to sleep. Imagine a magic script that monitors your lid state, and when it is closed, puts your machine to sleep. Some discussion threads from back then and pretty recent as well.

put external display off using a hot corner, close lid.

before closing the lid, press power button (actually long-press it and then click on 'Sleep').

close lid, unplug power adapter, plug power back.

unplug power adapter, close lid, plug power back.

Some tricks exist, none of them gets you a sleeping machine when just closing the lid:

This is known as 'closed-clamshell' or 'closed-display' mode.īasically, when you're connected with power adapter and there's an external monitor connected, when you close the lid, nothing happens.īut this mode doesn't fit all, and there's still no good solution, and there is no option to turn it off in settings. It appears that the configuration for the monitor in open clamshell mode is different to that in closed clamshell mode, and I'm trying to find out how to re-configure the closed clamshell mode when it does not display anything with it closed.You can use an external display or projector with a Mac notebook while its built-in display is closed. I use the exact same setup at work, with identical Keyboard and Mouse, but a different monitor, and that works fine. The MacBook Pro is plugged in to mains power, and is connected a USB Keyboard and Bluetooth Mouse. How can I change the settings back to normal so that it works properly? I now can't change it back as it is only broken when the lid is closed. I am using SwitchResX, to change the resolution, and I think I changed the colour from Millions to Billions, which broke it. I used to be able to close the lid and it would switch to just using the external monitor, but I have changed something in the settings so that when it is closed, the display is black. With the lid open, I get both displays working.

I have a mid-2015, 15 inch MacBook Pro, connected to a Dell P2715Q with a Display Port to mini-DP cable.

How to turn on macbook in clamshell mode