LG monitor not starting after reboot

Hi pjdsalwa,

Making sure that your external display's power cable and video cable are connected securely and correctly at both ends is a great place to start isolating the issue. The first section of this article will help you check your connections: Connect a display to your Mac.

If all is well there, and the issue persists, try testing the issue in safe mode. This will start up your Mac so that it performs certain checks and prevents some software from automatically loading or opening, which could help narrow down the cause of the issue. This article will walk you through the steps: How to use safe mode on your Mac.

Apple silicon

1. Shut down your Mac.

2. Turn on your Mac and continue to press and hold the power button until you see the startup options window.

3. Select your startup disk, then press and hold the Shift key while clicking “Continue in Safe Mode.”

4. Log in to your Mac. You might be asked to log in again.

Intel processor

1. Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up.

2. Release the key when you see the login window, then log in to your Mac. 

3. You might be asked to log in again. On either the first or second login window, you should see ”Safe Boot” in the upper-right corner of the window.

Regards.

Hello pjdsalwa,

We appreciate all of the troubleshooting you have completed to this point. The next step to resolution will be to contact Apple Support here: Get Support

Take care.

Hey pjdsalwa,

Happy to hear that you were able to get that figured out. Thanks for the update!

Have a great week.