phi1istine wrote:
Update: After I unplugged the charger (nothing else is plugged in) and then selected shut down, it actually shut down. When I plugged the charger back in (and did nothing else), the startup chime played and it started up again without being told to.
This is the current normal way the Apple USB-C laptops work.
Now, your original problem where you are connected to power & select Shutdown should result in the laptop powering down & staying powered off. Except....yes, there are always exceptions. With the USB-C Macs....more things can potentially wake or power on a laptop these days. Including any of the following:
- Connecting or disconnecting the power adapter
- Connecting or disconnecting any external device
- Touching any key on the keyboard
- Touching the trackpad
You can modify the behavior of a couple of items, but for the most part these triggers cannot be disabled.
Prevent a Mac laptop from turning on when opening its lid or connecting to power - Apple Support
You can try clearing the PRAM/NVRAM just in case there is some setting configured to power on automatically....of course this will wipe out any customized settings from the options in the Apple link I just provided in the last paragraph. Launch the Terminal app and issue the following command which will prompt you for your admin password, but nothing will appear on the screen as you type so press the "Return" key to submit the password.
sudo nvram -c
You may see mention that some certain item(s) could not be deleted/clear which is fine (can happen to the ComputerName). As long as the command itself executed successfully.....you need to restart the laptop in order for the system to pull the default NVRAM settings. Once you log into macOS again, see if Shutdown will keep the laptop powered off.
Usually if you are not triggering a power on event, then a reboot instead of full power off with the Shutdown usually signals a hardware issue of some sort most likely with the Logic Board or perhaps even a bad Lid Angle Sensor.
