MBP 15" unable to boot in clamshell mode
I am looking to use my Macbook entirely in clamshell mode, however, I am having a problem where it will not boot to OS when the lid is shut. I currently have a horizontal stand for the laptop so it is not a problem to open the lid for a second while it boots, but I shall soon be moving to a smaller desk which will only fit a vertical stand where it will be a bigger pain to have to open the lid.
What I have experienced; 1. Press power button and shut lid immediately OR turn on eGPU OR plug in eGPU thunderbolt cable. 2. eGPU and laptop whirr for about 15 seconds before turning off.
Is this expected behaviour and if so is there anyway around it? Additionally, it would also be ideal if I could see the boot device selection screen (between Macintosh HD and Bootcamp) on my external display.
Macbook Pro 15" 2018
LG 34UM95 (connected via HDMI to GPU)
Thanks very much in advance for any help.
NB: I did some research before and couldn't find any threads addressing the particular issue where the laptop won't boot to OS in clamshell (only that the device selection screen was not visible).
A bit of misreporting in my original post. It turns out that the actual issue is that the laptop isn't turning on at all when the lid is shut and then the eGPU is connected. So restarting or pressing the power button and shutting the lid does actually give the desired effect.
So the actual question that I should be asking - is there any way to turn on the MBP without pressing the power/touch ID button (and thereby opening the lid)? (I would also prefer not to use the scheduled power-on if possible).
is there any way to turn on the MBP without pressing the power/touch
The way I did it for ages was to plug the thrunderbolt cable (with electrical power) to the computer. This will start the Mac if the lid is closed.
Problem is: this worked when I had a thunderbolt display connected. Now that my new monitor is connected directly to the eGPU (and boot via the eGPU is not allowed on MacBooks) the computer turns on and then shuts off/sleeps briefly after that.