External display won't get video signal after MacOS update

Question

Level 1

4 points

External display won't get video signal after MacOS update

Hi, my system worked flawlessly until a MacOS Monterey 12.7 security update (yesterday, 3 Oct 2023): the external display (LG 32EP950-B) won't get video signal after going in standby or being manually shutdown. After turning on the display the system will recognize the display but will not send video signal.

The only workarounds I found so far are:

to reboot the machine;
in System Preferences: to change display refresh rate to 50 Hertz and back to 60 Hertz.

Any way to fix this problem and make it work as it should (as it was before the update)?

Thank you in advance.

Posted on Oct 3, 2023 1:43 AM

Reply

Answer 1

Nina2202

Level 1

17 points

Oct 4, 2023 4:38 AM in response to rafograph

Hi!

If the connected display is still not recognized by your Mac, try any of the following: Unplug the display from your Mac, then plug it back in. Ensure that the cable you are using is firmly attached to the appropriate port. Check that the cable you are using to connect your display is the right one.

Thanks!

Reply

Answer 2

rafograph Author

Level 1

4 points

Oct 4, 2023 6:32 AM in response to Nina2202

Hi! Thank you for your reply: those tips were among my trials on troubleshooting. Also, after many attempts on the OS side - Time Machine rollback, system reinstallation, OS Version update (Ventura) - I powered off the monitor and unplugged the power cord then after a few minutes powered up and the monitor worked correctly again.

Reply

External display won't get video signal after MacOS update

Similar questions