Progress Bar Stuck on 100% on boot High Sierra

If it was a third party software related issue, then High Sierra should properly boot in Safe Mode, but it's not.

I have this problem with an iMac 27" 5K (mid-2015 but I've bought it as new a few months ago) on an external brand new Seagate 2TB. I also tried to reinstall both from an USB stick and with internet restore (opt-cmd-R), on 3 different Mac. Still I can't boot.

It worked, more or less, for a few weeks and then one day I switched my iMac off and the day after it didn't load the login screen. Now I'm stuck.

I also tried to format (low level) the HDD and reinstall with Migration Utility, it worked for some days, then the same problem again.

I think High Sierra is the most unstable macOS I've ever seen in 20 years.

I ended up bringing my laptop to genious bar yesterday and problem was solved pretty quickly. Not exactly sure what caused the issue, but essentially my hard drive is intact, and being backed up at the Apple store now. Which was a relief. After a hard drive wipe and restore. Should be up and running again soon.

Since this morning without warning without any reason without any technical issue I am experiencing the same crazy High Sierra bug / problem. I have lost a full day trying everything i read online. Nothing worked so far. Something that makes me super super mad is the fact that after spending a huge amount of money for Apple and after the billion of profits they make the quality of their OS is getting worse and worse,,, Who is paying me back the time spent on this????

I just found the site below that claims to have a solution without needing to use a backup.

http://robinmonks.com/2018/01/crashed-too-many-corpses-being-created-how-to-reco ver-high-sierra/

It is exactly what you describe and what I experience. I will check out if it helps and will report later if it worked.

It really seems that it is a High Sierra issue and it is amazing that Apple does not react on it.

What is so great and new about high sierra to want to go through this? In my younger days I would done all this but for those of us with older Macs? Apple doesn't even support their own updated and if you do an extensive work around you're really in uncharted waters.

All these work arounds for something your Mac doesn’t need. Why high Sierra? Because it’s free?For what reason is everyone doing this. You won’t even see a difference in the older units. Call me crazy but I value stability. I work hard who has time for this nonsense. Banging your head on a desk would be more productive than this rinky **** useless upgrade.

500+ people have said they have this issue and still no clear answer? I tried to read the whole thread but so far it hasn't helped. Why don't they just say "hey we have a new OS... but it only works on the following products..." This is just like how they are killing off old iPhone after a few years. I am so glad that this happened on my old macbook, while my two other PCs are still working awesome! My Dads 2008 Dell is still running XP better than my 2012 Macbook trying to do high sierra....

I totally agree. I basically spent 5 days a couple weeks ago dealing with this issue, and not working, which doesn't seem like much, but it's definitely crippling when you are trying to run a small business.

I did use this as an excuse to upgrade to a new iMac, which is fine since it was long overdue, and the tech at the genius bar was super helpful and issue on the laptop was dealt with, but I still don't have a clear reason as to why / what happened. They never really told me what cause the issue, and essentially denied that it was the upgrade to high Sierra. In fact, the tech even told me that some of the newer Macs are having trouble with High Sierra.

So long story long, I am up and working after spending $1600 to upgrade, but I am left with a stank taste in my mouth over it.

Thank you for posting this. I did what you suggested and it worked. I was talking to Apple and they were somewhat helpful but I just couldn’t get my machine to restart after the recent High Sierra software update. Thanks to you I didn’t have to go buy a new machine. I erased my hard drive and use Time Machine and now my iMac works perfectly. Thank you thank you thank you!

I have the same problem.

I couldn't even boot to Safe Mode. I've tried everything that was suggested in this thread. After three days of trying, it is now stuck on 98% percent.

I can't afford to lose all my files. I don't have time machine back up. Please help.

Just wondering if anyone has had progress with this issue? I have a new 2017 iMac desktop I got for Christmas from my husband & have been stuck here as well for 3 days now. I spent 45 mins on the phone with tech support & after doing all the things mentioned here he had me load a copy of the HD in the utilities menu. It took over 2.5 hrs. to load & install only to end up in same place. Needless to say I am very upset as this is my only computer, it's brand new & I have taxes to file among other things. I made an appointment to take it in but their first appt. isn't for another week (snowbird season in FL 😭) so I'm stuck using my outdated iPad which isn't fun. 😡 I guess I am spoiled as this was a replacement for a late-2009 iMac that I never had an issue with the HD until last October. My husband replaced it for me so I wouldn't have this exact problem...go figure. 🙄😡😡

Same issue here. My imac is only six month old and yesterday I was very upset when I turned on my computer and I experienced this problem. I reinstalled MacOS, tried almost everything I read on this forum - reseting NVRam, disk utility and nothing worked. Still stucked. I made an appointment for this Saturday by phone. I hope I can get my imac working again.

Hi ChrisPiper. No, I've not tried this yet. But it could be a possibility, as far as I'll try everything to put my iMac working again. In the worst-case scenario, Apple will have to replace it for a new one, as it is under warranty. Tks for the reply.

Hi, I have this question too - I'm using a Mac Mini (I'm not sure regarding the model because it's no longer booting up properly but probably 2013s). I believe I made a system update, it rebooted, then the same thing happened - stuck on 98-100% progress bar. I already tried the different shortcut keys to attempt to boot it up and even tried accessing the drive via Target Disk on another Mac. It was only able to read the other partition which contained nothing (there were supposed to be 2 partitions). The 1st partition contains the Users files (or actually all of my files) but the partition is not mounting properly.

Via Recovery Mode, I tried to use the Terminal and also attempted to mount it via "diskutil mount /dev/disk0s2" but the result is "Volume on disk0s2 timed out waiting to mount". I believe this volume is 1TB in size. However, there was one time that I've seen the volume to mount again completely but it was just a very small chance because when I rebooted, it is no longer accessible again.

So is there anyway to fix this? Or is it that it just takes a longer time to mount itself? I'm not sure what I did before when all of a sudden, that volume mounted. But then again, I was not able to back it up so I'm stuck.

Hi, I have this question too - I'm using a Mac Mini (I'm not sure regarding the model because it's no longer booting up properly but probably 2013s). I believe I made a system update, it rebooted, then the same thing happened - stuck on 98-100% progress bar. I already tried the different shortcut keys to attempt to boot it up and even tried accessing the drive via Target Disk on another Mac. It was only able to read the other partition which contained nothing (there were supposed to be 2 partitions). The 1st partition contains the Users files (or actually all of my files) but the partition is not mounting properly.

Via Recovery Mode, I tried to use the Terminal and also attempted to mount it via "diskutil mount /dev/disk0s2" but the result is "Volume on disk0s2 timed out waiting to mount". I believe this volume is 1TB in size. However, there was one time that I've seen the volume to mount again completely but it was just a very small chance because when I rebooted, it is no longer accessible again.

So is there anyway to fix this? Or is it that it just takes a longer time to mount itself? I'm not sure what I did before when all of a sudden, that volume mounted. But then again, I was not able to back it up so I'm stuck.