Can anyone help??
I've just moved to macOS Sequoia 15.3
Now my second display (thunderbolt) which worked perfectly, about 2 hours ago is now dead and cant be detected. I've looked on line and it turns out it's a common problem. I wish I had just left the upgradfe.
IS there a fix?
Thank you
iMac 27″, macOS 15.3
It's very clear there is an issue with this update, the internet is full of it, already at least more than a month. No solutions worked for me. This is 100% a software issue on apple's side. I need the second screen for work and it affects my productivity a lot. When will Apple fix it?
I believe that is the case for the M1 Mac Mini, perhaps one of the laptops. The Mac Studio M1 I have supports three monitors because that’s what I’ve been doing for over two years. But I do have a Kensington TB3 dock where two of my monitors are plugged into. I would also guess the first M1 Mac Pros support at least three or more monitors.
That solution worked for me. However, I do not believe you need to download anything. I didn’t. Since it’s a .plist, if you drag the file to your desktop and reboot, the operating system will create a new .plist file. You’ll need to go in and manually set your preferences again, though.
I don’t know what I’m doing wrong but I just can’t find this file to delete it. I’ve tried about every single solution apart from changing leads which isn’t an option. Can anyone just let me k ow where to find this file. Thanks
I waited until 15.3 because of all the reported issues with multiple monitors. For me, at least, there are still issues with 15.3. I have a MBP16 with 2 Apple Thunderbolt Monitors.
Both monitors work for me.
HOWEVER, I have to reboot every morning to get both monitors to work. When waking up from sleep, only one of the Thunderbolt monitors is recognized. Restart MBP and back to both Thunderbolts working. A pain but at least they work.
I am having a similar issue since the 15.3 update and it is very frustrating to not be able to extend the displays in a reliable way any more. If I unconnected and connect eventually it will finally find it but it has been taking 20 minutes every morning to get his working. Do we have a timeline with this will be fixed. This is a horrible user experience.
UPDATE: This fixed my problem!!!
@geapgr. Hi there.
What was the remedy? I hope it works.
close the mac. disconnect ALL cables (all!). close the monitor or just disconnect ALL its cables. wait 5 minutes. reconnect and boot all devices. worked for me and I had the exact same problem
by "close the mac" do you mean sleep it via the lid or power it off?
shut it down and wait for 5 minutes having disconnected all cables. same for the monitor (disconnect everything)
Worked like a charm. Thank you.
need to follow the timeline to. when! and why
not working for me :(
This does not work for everybody. Even if it did, it *clearly* indicates some kind of OS issue.
I ended up buying new cables. HDMI to usb-c directly without using a docking station or adaptor, Reset NVRAM/PRAM and finally got it to work.
macOS Sequoia 15.3 wont let me detect my second display
