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Yes, next to where it says macOS 10.12.6. You're not high any more!
oups. I guess i was tired. Die Not notice that the Internet restore System was Sierra so it brought me back to 10.12. funny Thing is Even after updating Again to 10.13 the Internet restore is still 10.12.
anyone CAN tell me how to install a local recovery partition in 10.13?)
 
Walked back into my office today and found my iMac sitting with a black screen and flashing folder with the question mark. So strange.

I think it's time to say goodbye to high sierra for the time being and wait for a more stable beta.
 
Apparently a lot of install problems with apfs are caused by antivirus programs.
Uninstall before attempting to upgrade to High Sierra.
Sophos was the culprit in my case, but I've read about Avast as well.
 
Walked back into my office today and found my iMac sitting with a black screen and flashing folder with the question mark. So strange.

I think it's time to say goodbye to high sierra for the time being and wait for a more stable beta.

I have the same problem and made a Thread here in the 10.13 section. Is there any Solution? I try later to deactivate Power nap, maybe this is the Problem. No Virus Software is installed, this couldn‘t be a problem
 
Jeeze what a mess. Glad you guys posted all this. A wait and see situation I suppose. Still, it is kind of disturbing that they would unleash this beta even to early bird testers in this state.
 
I have the same problem and made a Thread here in the 10.13 section. Is there any Solution? I try later to deactivate Power nap, maybe this is the Problem. No Virus Software is installed, this couldn‘t be a problem

Honestly I have no idea. . . It was almost as if the screensaver is what caused the flashing "?" I had just been using the machine before for some dev work, left my office and about an hour later or so that's where I was.

What made it worse was converting to APFS and trying to re-install Sierra. The recovery partition wanted to install 10.13 as it was the "current" OS on the machine. On to Internet Recovery, which brings up Sierra, and then a whole host of other problems. When I went to format the drive from APFS back to HFS+, my fusion drive split. It took a bit of time to find an apple support discussion that had an extremely long terminal command which (after I wiped both the SSD and SATA again), was able to rejoin them back into a fusion drive.

Long story short: I'm back in 10.12.5 and that's where I plan to stay for the foreseeable future.
 
1 day later, sill trying to get HS on my Mac Mini, it's now in a state where I can't boot into anything except the High Sierra Install, I have no wired Apple Keyboard, no startup button presses are registered on boot up time from my Bluetooth Apple Keyboard, so it's more or less in a boot loop, it says it fails, I have to hold the D key to try to solve the disk problem yet nothing works.
I will try again with a bootable MacOs High Sierra USB stick.
Tried to get it to install from a MBP in Target Disk Mode, got a message it's not allowed, hell, I did that many times before.
Can't even start in Target disk mode anymore, otherwise I would just copy my disk to the internal SSD on my Mac Mini.
Eventually I will get there but this is not the way I remembered it to work.
First time ever it went wrong, and I have been on MacOs/OS X since the very start.
 
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I'm sorry, beta warnings not withstanding, it is shameful for them to let it out like this..
 
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I'm sorry, beta warnings not withstanding, it is shameful for them to let it out like this..

I bet there are plenty people without Install problems, my MBP Installed just fine, the one on my Mac Mini was completely borked, reinstalling from scratch, installing now from a Bootable USB stick, 6 minutes to go, yesterday it got stuck at 11 minutes, landed me in a boot loop, got out just half an hour ago.
Lets see how a clean OS is, never reinstalled OS X/MacOs since 10.0b.
 
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I'm sorry, beta warnings not withstanding, it is shameful for them to let it out like this..
They didn't "let it out like this". This is a Developer Preview, intended for developers only. The target audience knows exactly what to expect and how to work with it. eg. installing on a test computer. Perhaps you should wait for the public beta which may be more suitable for your needs and skill level.
 
Guess I I have been lucky, installed yesterday, iMac 2011; the installer wouldn't touch my internal SSD for some reason, instead did it on an external drive (usb2.0), it took about three hours to convert to new file system and migrate all my apps, then I was able to boot from the external drive which is a bit too slow, but surely works, today I'm going to backup and erase the sad and try again. Luckily I don't have any software that I will be afraid of losing.
 
I did format my main ssd and installed High Sierra, this time it took around 40 minutes, started the computer and a bit of a panic because none of my apps will open not even the native MacOS apps, so I re-started the iMac and everything was working great, only two apps stopped working (Path Finder, and TotalFinder) which is a shame because I use them everyday, I was expecting Finder to be re-vamped but still lacks lots of things for me.
 
Honestly I have no idea. . . It was almost as if the screensaver is what caused the flashing "?" I had just been using the machine before for some dev work, left my office and about an hour later or so that's where I was.

For me this works: reinstall from bootet System with .dmg high Sierra file. Deactivate Power nap. Now it is fast respsonsing after wake up, no flashing folder anymore.

—–forget it, today it crashes again. Going back to 10.12 now
 
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Curious (as I am not a beta) if my iMac has a couple external drives does the install only allow the internal (iMac) drive to optionally be converted to APFS during the upgrade? Which means I need to manually format my externals afterward and then restore all their data?
 
Update, I got everything back, I made a bootable USB installer, this time it installed fine, the SSD was already APFS formatted.
When it restarted it went through a few steps before it asked me to import files from Time Machine which I did, it went well until halfway, got stuck on a grey screen, restarted manually by holding the on button, asked me if I wanted to restart, next it started again with Language and keyboard settings and after again Migration Assistant, did that again and this time it finished.
Working High Sierra on a 2012 Mac Mini, 16 GB RAM, 128 GB SSD and 500GB HD.

My 2012 MBP had no issues at all upgrading/installing in place from Sierra to High Sierra, even from HFS to APFS went well.
Seems to me it's a problem if there is another HD inside the machine.

Curious (as I am not a beta) if my iMac has a couple external drives does the install only allow the internal (iMac) drive to optionally be converted to AFPS during the upgrade? Which means I need to manually format my externals afterward and then restore all their data?

Yes, I am pretty positive you have to do that manually, mine was connected and it's still on HFS+
Why should Apple take the risk of converting externals to APFS, it's already complicated as it is.
 
Install failed on my 2014 iMac 5k. 1 TB Fusion Drive. Selected the option to upgrade to AFS.

Install failed with a cryptic error after an hour or so.

Mac HDD partition no longer bootable.

Gonna have to restore from time machine.

Be warned.


I made the mistake of installing on an OLD mac book pro and the installation failed *** I DID NOT CHECK THE UPGRADE TO APFS BUTTON *** , after encrypting my HDD... I was in a reboot cycle and nothing as working - CMD-R would bring up this old 10.11 restore utilities but the HDD was encrypted and I couldn't unlock since 10.13 set up its own encryption keys

THe installer sets up a daemon to reboot once you login and it then starts the installer disk (boots from)... the HDD is unencrypted and it starts "installing 35 minutes" stuff.... but once its fails, you can open the console or startup disk... from this console I was able to backup data to another harddrive and then i was forced to wipe my HDD clean and install a fresh 10.12 installation

Be warned.Be warned.Be warned.
 
Mine installed without issue but it takes ages to boot and then just becomes unusable. I've reinstalled it twice but no luck. This is a pretty bad developer beta compared to the past ones, where I've NO issues at all.

Back to Sierra for now.

How did you revert back to Sierra? I can't find this one anywhere.
 
How did you revert back to Sierra? I can't find this one anywhere.

Use Internet Recovery (Shift-Option-Command-R) to delete any existing partitions and install a new copy of your operating system from Apple via the download option or from a Time Machine backup as this process will remove all data from your hard drive.
 
How did you revert back to Sierra? I can't find this one anywhere.
Reformatted and reinstalled. Tried installing it on an external HDD but came across the exact same issues. Maybe it’s because I only have 4GB RAM.

There is no way to downgrade. There never has been.
 
Hi All, I wanted to share my experience, someone might find it helpful.
I'm on a late 2012 iMac 27 with fusion drive. Leap of faith on High Sierra... First installation attempt failed because, I think, I asked to upgrade to APFS. Installation process came to a halt and I was already worried about reinstalling from scratch with only backup on external drive (no Timemachine)
Switched my iMac off, restarted holding Command +R and restored via internet. Restore process was with 10.13 and not with what I was thinking it would have been 10.12
This time I obviously did not thick to upgrade the file system and after 40 minutes my machine was up and running with High Sierra and most importantly I did not have to reinstall anything apps and such as all was there untouched.

Hi, I have the same exact machine as you and also ran into installation errors. I also booted into recovery mode unde 10.13. So what you’re saying is don’t select Apple file system and it works?
 
This is a dumb question but I’m having the same issues and see everyone talking about USB boots. I would like to get a USB for my gf’s iMac that runs Yosemite but for the life of me can’t find an easy way to download it to get iOS for that?

For this issue I had the failed install with the fusion drive and finally reinstalling Sierra from a recovery. Now down to a minute left and it was about 30-35 mins so far.
 
I suppose this is to be expected with a beta OS running on top of a beta filesystem. If only people knew how terrifying that is to your average tech. D:

TL;DR stay away.
 
I suppose this is to be expected with a beta OS running on top of a beta filesystem. If only people knew how terrifying that is to your average tech. D:

TL;DR stay away.

It seems to me you think this install issue a common problem, guess what, it's not.
If that was the the would be 100's of posts here instead of just a few pages with just a few people having
these install problems.
This was the first new install since I started using OS X from the beginning (OS X 10.0b), and only on one
machine, the other went fine.
Might have been a setting, or a strange partition table.
 
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