LG UltraFine 5k monitor no longer detected by 14” M1 MacBook Pro

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Level 2

257 points

LG UltraFine 5k monitor no longer detected by 14” M1 MacBook Pro

I have successfully been using an external 27" LG UltraFine 5k monitor with my 14” M1 MacBook Pro in clamshell mode since the day I got the MBP without problems. (This is the monitor Apple sells in place of the now-defunct Apple display)l

Suddenly, without any system changes I am aware of, the computer no longer recognizes the monitor either in clamshell or open. The computer continues to receive power through the monitor and all other devices (i.e. drives) to the monitor continue to be recognized.

I've tried all the usual things (restarting with/without monitor attached, unplugging monitor for 60 seconds, different cables and different ports, assuring OS Monterey is up to date) but with no luck.

Any thoughts would be appreciated.

Posted on Jan 15, 2022 9:28 AM

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Answer 1

judysings

Community Specialist

Jan 16, 2022 10:39 AM in response to Argelius

Hey there, and welcome to Apple Support Communities Argelius,

From our understanding, you are having issues with your external monitor being detected. We can certainly understand your concern and can help provide some insight.

We recommend checking out these links for more details on troubleshooting this issue: If your external display isn't detected or appears blurry on your Mac - Apple Support and Connect a display to your Mac - Apple Support

Let us know if that helps and kindest regards!

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Answer 2

Jan 17, 2022 10:11 AM in response to Argelius

Hi Argelius,

We appreciate your time and thank you for partnering up with us. At this moment the best course of action will be to speak to our Phone Support Team, so they can continue troubleshooting this issue with your monitor and MacBook. We recommend checking out this link for more information on how to contact us: Contact - How to Contact Us - Apple

Kindest regards!

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Answer 3

Argelius Author

Level 2

257 points

Jan 17, 2022 8:39 AM in response to judysings

I have tried all the steps in that support document, to no avail.

In further troubleshooting, I purchased a new monitor with powered USB C capabilities.

After attaching the new monitor to the MBP via USB C, the new monitor was recognized and worked as expected in clamshell mode. So I figured the old monitor went bad.

However, the next morning after reconnecting the MBP to the monitor via USB C, the MBP no longer recognized a monitor is attached. I tried different USB C ports on the MBP, as well as different cables, but still nothing.

Then I attached the MBP to the new monitor via HDMI which worked. So there's some USB C external monitor issue (and very confusing that with both monitors it worked...until it stoped).

Any ideas? Thanks!

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LG UltraFine 5k monitor no longer detected by 14” M1 MacBook Pro

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