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Mac stuck on grey progress bar after Catalina Supplemental Update

Hello all,


I have a Macbook Pro mid-2012 and it is stuck on the grey progress bar every time I try to switch it on. It was working fine till today morning, it was sleeping and was charging but then when I tried to wake it up, it made the startup vibration, showed me a blue screen with a few rectangles. Worked fine for some time, got very slow, and then I went for a restart but it won't boot on. I had updated to Catalina sometime back and supplemental update just this friday.

Here are the things I have tried:

  • SMC/PRAM reset
  • Pressing Shift Key to go into Safe mode, it still won't start up all the way
  • Trying to go to recovery mode using Command R, earlier it went, but was stuck at something like examining volumes, now it would not go into recovery
  • Tried Option Shift Command R to install OS which came with it originally, nothing happened.
  • Tried verbose mode, stopped at pci pause: sdxi... probably some hardware issue; earlier also when I had faced this, I erased disk, installed original MacOS and then worked up my way to MacOS Mojave; worked fine for a few days but since pages and other things were not available, had to update to Catalina and till then it was fine
  • Tried removing the unsupported kext files using some command line commands but it had not worked earlier when I had faced the same problem


I had to do this earlier also because I thought it is a problem with my Mac, maybe it is; But I think it is because of the Catalina Supplemental Update (and I feel stupid to have forgotten that because of this tiny update I would have to go through this world of pain), so **** buggy. Request someone to help me out with this please, I feel I am really out of options now ;(

Been stuck at the image below for like 20-30 minutes


MacBook Pro 13″, macOS 10.14

Posted on Aug 2, 2021 3:49 AM

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Posted on Aug 2, 2021 7:08 AM

Since you have already reset the SMC & PRAM, this issue tends to point to a failing system drive.


Give the following support article a try to see if it can help:

Similar questions

2 replies

Aug 2, 2021 7:06 AM in response to Ben_Tony

Ben_Tony wrote:


I had to do this earlier also because I thought it is a problem with my Mac, maybe it is; But I think it is because of the Catalina Supplemental Update

Been stuck at the image below for like 20-30 minutes
https://discussions.apple.com/content/attachment/3ea02a13-0452-4201-8f0d-3783322fc27b


20-30 minutes is not so long— I would let it finish.


If you are truly stuck you can always force a shutdown by holding the power key ~6-10 secs. Reboot as normal and see where this leaves you.



Log out, sleep, wake, restart, or shut down your Mac - Apple ...


Mac stuck on grey progress bar after Catalina Supplemental Update

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