User profile for user: antdude
antdude Author
User level: Level 2
224 points

No HDMI monitor display while booting up MBP?

After turning on/booting it up, I noticed the external HDMI monitor is blank black (still has a video signal) until after I log in and right before I see the desktop screen. Shouldn't I get the display right after booting up/powering on MBP?


Detailed setup: 13(.3)" 2020; A2251 model; MWP62LL/A; Intel Core i7 MacBook Pro (2.3 GHz; quad-core 10th gen. i7 CPU; 8 MB; L3 cache (Turbo Boost up to 4.1 GHz)), 32 GB of 3733MHz LPDDR4X RAM, 2 TB PCIe-based SSD, Intel Iris Plus graphic, macOS Ventura v13.6.4, etc. from 12/29/2020. Using Apple's USB-C Digital AV Multiport Adapter with ASUS VA27DQSB 27" 1080P monitor(HDMI) & an old USB-A (with Apple's USB-C to USB Adapter) mouse.


Thank you for reading and hopefully answering soon. :)

MacBook Pro (2017 – 2020)

Posted on Jan 23, 2024 11:23 AM

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User profile for user: Grant Bennet-Alder
Grant Bennet-Alder
User level: Level 10
142,057 points

Posted on Jan 23, 2024 11:37 AM

for most external display, the display that shows "boot-up screens" including the login screen is the PRMARY display.

the traditional way of designating the PRIMARY display has been to drag the tiny Icon of the Menubar to it the Arrangement window for extended desktop setup:




So in this illustration from Older MacOS you can see the tiny icon of the menubar on the display in the lower right. That is where the 'boot up screens' will appear.

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User profile for user: Grant Bennet-Alder
Grant Bennet-Alder
User level: Level 10
142,057 points

Jan 23, 2024 11:37 AM in response to antdude

for most external display, the display that shows "boot-up screens" including the login screen is the PRMARY display.

the traditional way of designating the PRIMARY display has been to drag the tiny Icon of the Menubar to it the Arrangement window for extended desktop setup:




So in this illustration from Older MacOS you can see the tiny icon of the menubar on the display in the lower right. That is where the 'boot up screens' will appear.

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No HDMI monitor display while booting up MBP?

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