You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

Mac Mini M2 Pro with LG 5k2k UltraWide now flickers on Sonoma OS.

After upgrading to Sonoma, my Mac Mini is having issues with the thunderbolt cable to my LG ultrawide monitor. It is black screen then flickers on for a split second. I have a workaround where If I connect the HDMI cord also to the same monitor then mirror the desktops and display the thunderbolt only, it works ok. I have booted safe mode, reinstalled OS, etc and still no luck.

Any suggestions? Is there logs I can pull?

Mac mini, macOS 15.1

Posted on Nov 24, 2024 12:53 PM

Reply

7 replies

Level 10

82,594 points

Nov 24, 2024 1:23 PM in response to brandennevius

Replace the LG supplied cable with a short Apple Thunderbolt 4/USB-C cable.

Reply

Level 10

82,594 points

Nov 24, 2024 7:13 PM in response to brandennevius

Those aftermarket display manufactures pulled cables from the lowest bidder and you were lucky to not have had issues in the previous macOS version.

Reply

Nov 24, 2024 5:10 PM in response to den.thed

Just ordered one. Will give it a shot. Did they change something in the OS upgrade?

Reply

Nov 25, 2024 6:13 AM in response to den.thed

Will a thunderbolt 5 work?

Reply

Level 10

82,594 points

Nov 25, 2024 7:54 AM in response to brandennevius

Yes a TB 5 cable is backwards compatible to TB 4.

Reply

Nov 25, 2024 8:00 AM in response to den.thed

Interesting, I picked one up this morning and still same issue. Brande new Thunderbolt 5 with newest OS.

Reply

Level 10

82,594 points

Nov 25, 2024 1:29 PM in response to brandennevius

What cable..?

length and spec's or web link please.

Reply

Mac Mini M2 Pro with LG 5k2k UltraWide now flickers on Sonoma OS.

Welcome to Apple Support Community

A forum where Apple customers help each other with their products. Get started with your Apple Account.

Learn more Sign up