Big Sur - will not boot with Thunderbolt monitor connected

I have the same problem after upgrading to Big Sur.

MacBook Pro Late 2013.

Reinstalled my CCC Catalina image but will not boot. Goes into startup-sound loop.

Had the hardware checked-out and everything is fine.

After Apple logo appears I can attach the Thunderbolt display and it boots fine and everything seems ok. Just will not boot when attached.

Any fix would have to address the firmware issue in CATALINA now as I have no intent to update to Big Sur anytime soon.

I did the 11.1 upgrade last night to Big Sur but it has not fixed - and did not say it would in the release notes , the camera and speakers not working on Thunderbolt screen. I have not experienced the crashes I was getting before but early days...

I have done that. This firmware upgrade will not fix the big sur and thunderbolt issue because this it was not released to do this. It is a great upgrade if you want to use those big new air headphones thou. Obviously new users of new products are more important than existing users.

Andy, I think it might be easier for me bang my head on the keyboard than to get you to understand me. I had NO issue with connecting my 2016 MPB to my thunderbolt screen in the first place after upgrading to Big Sur - apart from the issue that many had which was I had to disconnect the screen to power up laptop then plug screen back in.

The issues I have left, which I thought I had successfully articulated before, but obviously not well enough, are that my camera and speakers do not work on Thunderbolt screen. The USB hubs are intermittent depending on what peri I have plugged in, for example printer works, Iphone connection does not..this firmware update does not fix that (it did not have that fix in release notes!)

So why are you posting in the thread titled "Big Sur - will not boot with Thunderbolt monitor connected" then?

You should be banging your head in a "Thunderbolt camera and speakers dont work in Big Sur" thread.

That way you won't be confusing people with your "it does not fix the issue" comments because your issue is NOT what this thread is about.................you might get some responses then that help with your specific problem.

That is true - my mistake. I am already in the "Thunderbolt camera and speakers don't work in Big Sur" thread - got confused - thought both threads were amalgamated. I shall go and bang my head back over there.

yup I hope so - by the way there are peeps on https://discussions.apple.com/thread/252038098?answerId=254078643022&page=3 talking about the same issue as this thread so I give up, and hope in the fullness of time there is a firmware fix for my issues. luckily in the current climate I don't need to use my big screen with camera/video conferencing very much..!

[Edited by Moderator]

At Startup my iMac (Retina 5K, 27-inch, Late 2014) does not recognise my bluetooth (keyboard & mouse) while the external hard disks (TB & USB) are attached, this AFTER updating to BigSur, yes I have done all the "resets" and eventually did a reinstall of BigSur (the problem still persists). If I do a startup WITHOUT the external hard disks (TB & USB) attached, the bluetooth keyboard and mouse are instantlly recognised and then I have to attach all the HDs... Not an elegant solution!

I know that feeling. I have had to buy a usb webcam to put on top of my thunderbolt screen then cable into my MBP to use video conferencing on the big screen. Pretty essential for my work to use large screen. I am hoping apple will fix firmware in next release.

MBP 2016 user. The only major issue I am left with is the camera on my thunderbolt screen. It does not work on Big Sur, and if I try to activate it with FaceTime it takes out my thunderbolt USB ports then I have to restart. My workaround is to have a USB camera now popped on top of my thunderbolt screen. I also removed my USB dock as it was causing the MBP to crash a few times a day, when I removed it MBP more stable.

I have the exact same issue on a Mac Pro 7,1 ... extremely annoying. Every time I need to restart it, I have to disconnect all the devices and then reconnect them after I'm reasonably sure it has finished booting ...

Same problem here, I have submitted feedback/a bug report to Apple the first day Big Sur was released, I hope they will see it.

i have no actual clue what you are babbling on about............

ditto for me. I've submitted detailed bug reports.

Can Apple please respond and give us some kind of feedback/update on when a 'fix' to the current Big Sur/Thunderbolt monitor restart issue is scheduled to be implemented??