studio display not working properly after 16.4 firmware update

I had the same issue as you, as mentioned below. I tried everything, and the only thing that worked was removing the cable from my MBP and plugging back in. But after every sleep, it would start again.

It looks like I might have done the whole switch screen-off thing wrong. Cos, I did it a little differently and now have no issues.

1. First, remove the cable from the MBP.
2. Then, unplug the monitor from the plug socket.
3. Leave for 5 minutes (make a coffee).
4. Plug the monitor back into the plug socket. Leave for 30 seconds; some dots should appear.
5. Then, plug it back into the MBP.

I was doing the above but leaving the cable plugged into the MBP, which did nothing. But removing it first seems to work. Maybe the screen gets a little power from the MBP.

Yesterday 5/23 I exchanged my Studio Display for another one. The defective display was powered up for the first time on Friday 5/19 with my new Mac Studio. On Saturday 5/20 I discovered that the display would not wake up after pressing a key on the Magic Keyboard. I verified that the Mac Studio was awake because pressing the play/pause key on the keyboard would start playing music from my library.

After a couple of support chat sessions that failed to resolve the issue, I decided the problem must be with the Studio Display itself and 5/23 was the last day of the 14 day return period (the Mac Studio was not delivered until Thursday 5/18 but I picked up the Studio Display on 5/9).

The replacement Studio Display is working perfectly. However there is now a Software Update notification that a Apple Studio Display firmware update to version 16.4 is available.

When I first powered up my new Mac Studio on Friday 5/19 there was a Mac OS update that executed successfully. I don't remember if there was also a firmware update executed for the Studio Display and I never took note of the firmware version of the Studio Display that I returned for the exchange.

The firmware version of the replacement Studio Display I have now is 15.5.

I am terrified of executing the firmware update because I suspect that is the cause of the problem with the Studio Display that I returned for the exchange.

I am curious if anyone else is having a similar problem with version 16.4.

That worked for me for several months. I just tonight got a MacOS update followed by a Studio display firmware update. When I did both my Studio display is now bricked. No remedy from Apple support. I have to take it into a store 2 hours away and leave it. Never again.

Try the settings exactly as shown here Wake up a remote Mac mini - Apple Community, might fix.

What year iMac? OS version?

I have the same issue with the 2017 MBP. The only way to solve it is to remove the Thunderbolt from my Mac and plug it back in. But it will happen again if I wake the mac after a long period.

👍🤞