macOS Sequoia 15.1 Does Not Connect to Apple Thunderbolt monitor.

Hello!

Not only Thunderbolt monitors have this problem, but also normal monitors with HDMI on Thunderbolt cables. Immediately after installation, the monitors turn on and off - they have permanent signal loss, although the image is still available in the background.

I have a Mac Studio with 2 monitors and after every restart the ON/OFF theater starts again.

Apple Support at a loss!

But now comes the strange thing:

If I connect the MacBook with OS Sonoma to one monitor and keep the other on the Mac Studio with OS Sequoia 15.1, both devices connect and I can access the MacBook with the mouse and keyboard from the Studio and...

The monitor on the studio stops going ON/OFF.

Unfortunately that's not a solution, because when you restart the problem is back...

Since both computers are M2 and new, Apple support has only had one solution so far... Install a new copy of OS Sequoia and again and again...

Since upgrading to Seqwuoia 15.1 my Apple Thunderbolt Screen has refused to talk to my MacBook Pro.

I have just spent the whole day working with the Apple Support Team and they could not find a work around to get my MacBook Pro 13" M1 2020 to talk to the Apple Thunderbolt screen. Works fine on a Dell Screen but all I get on the Thunderbolt is a black screen. It is hard to make up !!!!!!!

It is ridiculous that a software update makes an Apple Product incompatible with an Apple MacBook Pro.

If any one has a solution please post it here.

Same thing happened to me with an Intel Mac Mini. I have two monitors: an Acer and a thunderbolt monitor. Both worked fine until I upgraded to Sequoia. Afterwards, the audio works from the thunderbolt monitor but not the display.

So it looks like it is an apple software issue - it would be great if they would tackle it and the costs we have all had to make in terms of very expensive monitors is not wasted investment. At the moment if feels like "built in obsolescence, which is not in the interests of the planet but in the interest of !!!!!!!!!!

I would hope Apple Support would also be signalling that this is an issue that needs to be fixed and be honest with people when they ring up, that they are aware of the problem, and at the moment nothing can be done to solve it until the software is fixed. We all value Apple support and want to see its credibility maintained.

2019 Intel Macbook Pro 26" with thunderbolt 3 to 2 adaptor from Apple and an Apple Thunderbolt Display (27") - working for years and years until my very first boot up of Sequoia. The display's USB ports are working... and the display audio is working - just no video. Settings->Displays does not show that it has detected an external display.

Are they doing anything about this?? Has anyone out there found a solution?

Same here after the 20th of February.

Apple Thunderbolt 27 display works fine on my MacBook Pro 2014.

USB-C Adapter has been replaced.

Popup accept accesories pops up and disappears again.

Non of suggested solutions work. Did you find one which works?

You could have a bad all in one cable. Run a TB2 cable directly to one of the TB pets on the display bypassing the all in one cabe.

The problem is most certainly a software issue created by Apple that needs to be fixed !!!

Just tested my MBA M1 with my TB display and no issues. I'm running 15.1.1. Using the normal TB3 to TB2 adapter.

exactly the same issue !!! Thunderbolt Display works with old macOS 'es but the Seuqoia doesnt work thats why i cant use my macbook !!!!!

@Huskyeye - Can you please share the specific cable that you purchased? I am using a TB Display to a MBA M1 from 2020. Looking to understand if I can replicate your fix. Thanks!

.

btraven,

Your issue is one that is different.

Open the Audio Midi Setup utility and setup your Audio input and output there. Please start a new topic thread if you have persistent issues.

Just updated my MacBook Pro 16 to Sequoia and now my trusted Apple Thunderbolt 27 display is not being recognised!!! Help please?

This resets the display (not rest, sorry)