Sequoia latest update wreaking havoc on system

Usually if a screenshot does not show the graphical glitch, then it means the problem is a hardware issue with the LCD Panel. However, in this case with flickering video there is a chance a screenshot could possibly take a snapshot in between the flashes & capture a perfect image. Try a screen recording using QuickTime Player. View the Screen Recording on another device or display to see if it shows up there as well. If the issue is not shown by the screen recording, then you have confirmed a hardware issue with the LCD Panel (or possibly internal display cable).

How to record the screen on your Mac - Apple Support

If you have a 2021 iMac as shown in your signature profile, then you could try reinstalling macOS 14.x Sonoma (requires a clean install by first erasing the disk or rather deleting the "Volume Group" followed by installing Sonoma & restoring from a backup).

That's looks like the hardware problem with the M1 iMacs probably brought on by the intense load on the system and components during the upgrade and update.

The following topics illustrate the Silicon M1 iMac Display problem:

The following topics illustrate the Silicon M1 iMac Display problem:

Screen Failure on 24-inch-iMac, M1, 2021 - Apple Community

Persistent horizontal lines appear on iMac Screen - Apple Community

Horizontal Lines on Screen of iMac, 24", 2021

Horizontal black lines covering bottom 3rd of 2021 M1 iMac screen

Grey horizontal patches on my M1 iMac 2021 model

Horizontal lines at the bottom of iMac(M1,2021) screen

Horizontal Lines on 2001 M1 iMac Display

It's been reported that the repair cost for the screen is around $600. Some are circumventing that cost with an external monitor (which can be had for as low as $100 for a 27" monitor). So far there's been no indication that a recall/fix will be offered by Apple. But, be sure to tell Apple about the problem at Tell Apple what missing features you'd like restored or new features added to the system via Feedback - macOS - Apple.   Remember the squeaky wheel gets the grease.

You can take it into the nearest Apple Genius Bar for a free diagnostic of your iMac and a repair cost estimate.

Thank you for your response! There was a typo; my Mac is on 15.0.1, and that's what caused the issue. I went to the Apple store, and they conducted diagnostics. Surprisingly, even after Apple confirmed it was a hardware issue (either the USB-C ports or the logic board), my MacBook powered up, which I find quite amusing.

I managed to get it working by completely draining the battery (this is crucial) and then charging it for ~4 hours, after which it powered on.

horacenalle wrote:

My MacBook has been rendered useless by Sequoia. Can I uninstall it?

If your laptop had an older version of macOS before, then you can perform a clean install of macOS by erasing the disk (or rather deleting the "Volume Group") followed by reinstalling macOS & restoring from a backup. How you do this varies by the exact model of the Mac.

Use Disk Utility to erase an Intel-based Mac - Apple Support

Use Disk Utility to erase a Mac with Apple silicon - Apple Support

Creating & using a bootable macOS USB installer may be needed to reinstall a specific version of macOS (the OS must be compatible with your specific model Mac):

Create a bootable installer for macOS - Apple Support

With a 2018-2020 Intel Mac using the T2 security chip requires first modifying the system security settings using the Startup Security Utility to allow booting from USB:

About Startup Security Utility on a Mac with the Apple T2 Security Chip - Apple Support

You can't uninstall macOS updates. The only way to revert back to a previous version of macOS is to restore from a Time Machine backup. Follow this Apple support article for help: Restore your Mac from a backup - Apple Support

Cheers,

Jonasilver137

Well, not exactly. Anyone with a computer that shipped with a previous version of the OS can do a system restore back to the original OS without using Time Machine. Do a clean install by rebooting to system restore, wiping the disk using disk utility, and use the restore function, which connects directly to the Apple OS servers or your Time Machine (your choice - if buggy OS, probably best to go original from the Apple server rather than use your own backup). Exact process varies depending on Intel or Silicon processor. During the process, you can elect restore from Time Machine, but that's non-essential. You can use migrate to move files from backup or Time Machine after the OS install back to the original OS.

There are reports Elsewhere regarding the Original M1 iMacs having this type Display issue

https://www.macrumors.com/2024/10/01/m1-imac-horizontal-lines-issue/

Solution are unknown at this time

To be constructive 🤞

Start now and open an Apple Support Ticket as they are PAID  Apple Employees to deal will these types of issues . 

 Product Feedback - and make it known to Apple regarding this ongoing issue

Have the computer evaluated by the Professionals who have the Special Hardware Software and Expertise to diagnose the issue and offer possible solutions

Make an Appointment at the Apple Genius Bar or call 1 800 MyApple and have them evaluate the computer

Other location Call Centres 

 Contact Apple for support and service

Yes, everything since Mac OS 15 seems very buggy. I do not believe it is a hardware error. Silicon Macs use unified memory, so the GPU graphics memory is the same as the CPU processing memory, simply separated by several abstraction levels, and as it feels here by a software level gone wrong. I don't think there is much you can do apart from downdating or waiting for the next update, although downdating will not remove lower level firmware updates, which only can be restored with a second Mac.

Ree28Apple wrote:

My Macbook pro 2019(intel) stopped charging exactly after MacOs 15.1 and both the ports aren't working. Visited Apple store and they have mentioned its a hardware issue and parts need to be replaced. Personally I'm pretty sure it happened due to OS update but there's no way I can prove it and Apple isn't taking responsibility.

A macOS 15.1 update could not have caused any damage because there is no public release of macOS 15.1 yet. macOS is only at 15.0.1. Plus it is against Apple's rules to discuss any Apple beta software on this forum. If you have used a beta OS, then if anything breaks that is part of the agreement since beta software is still undergoing development & testing....use at your own risk.

Besides Apple's Diagnostics may be able to confirm a hardware failure (if the diagnostic finds a problem, then you have a hardware issue). Or if the charging issue occurs outside of macOS Sequoia, then it is not a Sequoia specific issue.

FYI, the 2019 model laptops (especially the 16" model) do have a much higher rate of Logic Board failures than any other model.

Had to do a factory reset on my mac mini M2. I did not have time machine setup. Luckily it was a new machine, but still lost about 5 hours of machine setup time having to set everything up again.

The update to 15.01 basically rendered my machine unusable including the OBS Studio software. Windows updates weren't ever this bad, terrible what Apple has become.

It's happening to me too. The hard drive was indexing for DAYS. The process was slowed because it would be delayed in Sleep Mode. I finally went into Battery > Options > "prevent automatic sleeping"

According to Activity Monitor, Indexing monopolized 90% of CPU.

I think the drive has calmed down, but with the advent of Apple Intelligence, 4.91GB is now held hostage. I consented to try it, then noticed serious lag, so turned it off but the data still lives on the drive.

Just checking in to see if Sequoia is fixed and stable, apparently it is not. Using MBPs 14 M3 Max. Nothing but problems with Sequoia, which is too bad since I want to use the AI. The System continually logged me out of every app, requiring repititous log-ins for each, which is a big PIA and time sucker. Sequoia rendered computer basically non-usable. Did a total erase, wiped the disc, re-installed Sonoma. While not perfect, it's not trashing everything as Sequoia did. N.B., I also have a 2011 iMac i7 running High Sierra. No problems at all with anything. Just keeps chugging along doing its work reasonably well with reasonable speed. No downtime trying to get it to function. It's glitz vs functionality. My CRM made me switch to newer OS to sync to my IOS devices, otherwise I'd never gone to the newer OS. Looking back over the many years (30+), can't say that apps like Word are improved over Word 5 as far as function in the real world is concerned. Some apps require the newer OS, but for 90% of real work, the old is better than the new regarding functionality and GTD. Time is money. Spending 10 hour a week (500 hours a year) fighting with the software is a money losing game. I think I'm going to buy an i9 that will run High Sierra so I can use my legacy apps (fully paid, no subs).

The exact same thing just happened to me. Upgraded my 2020 MacBook Pro because the Magic Mouse I bought wasn’t connecting properly and I read that it was likely because I needed to upgrade. Immediately after the upgrade my laptop was no longer charging in either of the ports. I brought it into Apple today and after they tried everything to restore it, I was told the logic board was probably affected and needed repair/replacement. Called Apple and they refuse to cover this repair because as far as they see it, there aren’t any “known” issues with Sequoia upgrades and that it could be due to an underlying issue. My MacBook was in great condition, had paid for Apple Care and never needed to file a claim and this happens 1 year after it expires and according to them my computer is too old. So $3,000 laptop apparently isn’t intended to last more than 4 years. Total BS they just don’t want to set a precedent.