Bootloop after sonoma update -2020 intel MBP

Had the same issue, uninstalled little snitch and the bootloop stops

Assuming you've already tried the standard 'common keypresses' and the Apple hardware test, try these:

• Make sure no USB or any other peripheral is connected
• Boot into safe mode
• Remove any invasive or system apps that might be causing a problem
• Try reboot

Still a problem?

• Boot into safe mode
• Grab a copy of your data by copying things to an external disk. Usually your home folder is enough.
• Reboot into the installer, use disk utility to completely wipe your hdd
• Install again

Let us know how you go.

Uninstall the suspected Application or Applications

If that is not within your comfort levels >>

Download the Application Etrecheck directly from the Developer.

The Application is Not a " Silver Bullet "  and is only a tool to examine the Hardware / Software used on this computer 

This is a Diagnostic Tool that makes no changes to the computer Hardware / Software used on this computer 

The application is free or paid from added features. 

The Report will Not Reveal Any Personal Information. 

Post back the Full Report - copy and paste - >>>> using the Additional Text Icon ( 3rd Icon to last ) <<<<

Hi,

I had the same issue last week.

After trying all possible system safe boot, system repair and so on, the ONLY WAY was finally to totally reset the MacBook and process a clean re-install (in my case, both macOS and Windows10 BootCamp).

Fortunately, during the preceding days, I installed a 2d Mac and transfered all my data, apps & setting from this MacBook. I was therefore able to retrieve them from this second computer, which made the process fairly straightforward. But it was still a waste of about two days' time.

I have a 2019 Mac book pro and got the same boot failures after a while after upgrading to Sonoma. Till now (I have 14.5 (23F79) installed) the problem has not been fixed. I also installed Sonoma new on the computer, and the problem kept showing even without installing any third party software.

It seems that it has to do something with the graphics adaptor. Every time I connect or disconnect the external monitor, the screen freezes. Also, when it goes to sleep it stays black. The computer has a Touch Bar and sometimes it seems to work, be pressing a virtual key the key changes color to indicate that its pressed. But the main screen stays black. It is like the os is still working on the background but there is a failure in the screen...

When I try to boot up the computer I get the apple logo and the bar and after some seconds it shuts down and starts to boot up again. Then I get the error page that says there was a problem - press any key. This cycle continuous until sometime the boot up procedure is a success. If that happens, the computer works perfectly.

The boot up failure cycle can carry on till 2 hours. It varies.

This week I found out that if a have the external monitor connected and the power cable not connected it will have some boot up failures but in not more that 5 minutes it will boot up successfully.

I hope this is a software problem and with the new os version it will go away. It is a shame...

Macmacmacmac75 wrote:

Thanks a lot for your advice. No USB devices were connected. Any hints on which apps could be create problems? Or how I could identify them? I don’t have much softwares installed.

Any Third Party Applications that will interfere with the normal operation of the OS,  is an invitation for disaster. 

Certain Applications maybe available on the Apple Apps Store - this only means the Developer is prepared to pay Apple a portion on each sale. 

Any of the below should be removed as per Developers Instructions 

Disk Cleaner 

Third Party Security Software 

Other question, if I do a Time Machine back up, and if I restore it in a clean install I guess it would replicate the issues if I load that back up?

If you do in fact restore form a Time Machine Backup and use Transfer to a new Mac with Migration Assistant and choose the Resort ALL

Yes, it will Re-Introduce to same issues that existed when the Backup was made back into the otherwise Pristine Installation

Im in same situation stuck in boot loop, but i cant enter in safe mood as it keep turning black screen. Like flashing in and out. I cant type password even i removed firmware password still cannot access safe mode as it goes to black screen within 1 sec then stay black 7,8 sec. Any solution? How to enter in safe mode and how to removes these apps?