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모델 A1419 / Late 2013 / 3.2 & 3.4 GHz Core i5 또는 3.5 GHz Core i7 프로세서, ID iMac14,2

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2013 iMac 27" Won't install El Capitan from USB Flash drive

Hopefully someone can help me. I have a 2013 iMac 27” that was running MacOS Catalina. Something went wrong and it got messed up so I had to reimage it. I re-imaged it with a El Capitan USB flash drive I had a long time ago and it worked fine. However, the next day my iMac would no longer boot past the Apple Logo with loading bar. Now if I try to reimage it again with the same flash drive it gets stuck on the Apple Logo with loading bar. I have tried the flash drive on another iMac I have a 2015 model and it loads up the El Capitan installer just fine, but it won’t on my 2013 iMac. To make matters even more weird is I can install Windows 10 just fine on the iMac, but if I try to install El capitan it freezes on the Apple logo and loading bar still. Any ideas? Is this a hardware issue? Graphics card/logical board or SSD issue? I already then the diagnostics test and everything passed. Hopefully someone can help me. Thanks.

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Oh boy! What a mess!

You’ve jumped around between what your system had when you bought it El Capitan (which used HFS+ file system) to then through the upgrades and when you jumped to High Sierra or Mojave your file system was upgraded to APFS and then you installed MS Windows which uses either NTFS FAT32 or exFAT What’s the Difference Between FAT32, exFAT, and NTFS?

So you’ve thrown just about everything but the kitchen sink at this system!

So… How do I get out of this Gordian Knot problem!

You’ll need to setup a new OS installer which is Mojave or newer (I’m assuming you wanted to drop back as you encountered issues with Catalina - it can’t run 32bit apps) which could have messed you up.

OK, so we need to get the proper OS installer from here How to get old versions of macOS I recommend you stick with Mojave as such here’s the guide to create a bootable OS installer.

First get a 16 GB or lager thumb drive and using your other Mac reformat the drive to GUID with a Journaled file system.

Now follow this guide How to create a bootable macOS Mojave installer drive

With the bootable installer in hand reboot your system and press the Option (⌥) key to get to the startup manager to make sure you have booted up under the OS installer. Exit the install process for now using the menus select Disk utility.

Now you’ll need to reformat your drive fully. If you have a Fusion drive you’ll need to break it as well after we get the HDD working then we can re-enable the SSD to it making the Fusion Drive again. If you have upgraded your HDD to a SSD then you don’t want to create a Fusion Drive set! If you have upgraded your PCIe blade drive you really want a dual drive config were the blade drive is your boot drive and the 3.5” SATA HDD/ 2.5” SSD is your data drive. This is all using the disk utility within the OS installer drive menu.

Once done restarting your system again without any actions should get the installer and go through the install process to the boot drive you want. Are you able to get to that point?

Reference Mac startup key combinations

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So I successfully installed Mojave on a 32GB USB flash drive. I booted from it using the option key after turning on the iMac. It starts up with the Apple logo and loading bar. The loading bar slowly moves across the screen where it reaches about 75% full and then stops. I've waiting over and hour and still stuck. I have tried installing Mojave 3 times now and the same thing happens every time.

To make sure the 32GB USB flash drive is good with the Mojave imaged I tested it out on my 2015 iMac and it loads up with the Mojave installer just fine. I didn't proceed with the install of course, but it does load the installer up unlike my 2013 iMac model. So I know the USB flash drive is good.

I can let my 2013 iMac continue to boot up to the SSD and it loads the Windows 10 OS (which is what is currently installed) just fine. I can login and use Windows 10 and everything. But I don't want Windows 10...I want a Mac OS back on the iMac.

So do you have any more ideas? Thanks for your time.

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@joshdantzler - You didn't format the drive if Windows boots! Restart the boot up under the OS installer then Exit out of the installer!Go to the Menu to get to DISK UTILITY As you need to first get rid of what's on your drive.

Think of it this way... I have my foot in a shoe and you try to shove you foot into the same shoe! Clearly we both can't wear the same shoe can we? Thats the Rub! You have Windows (my foot) and now you want your foot (macOS) into the same drive.

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@danj I don't think you understand. The OS installer never comes up on my 2013 iMac. As soon as I press the option key and boot from the USB flash drive the Apple Logo and loading bar comes up and it stays on that loading bar on 75% for hours now and nothing happens. I never see the OS installer. I know what you are talking about going to Disk Utility as I can see this on my 2015 iMac when I boot up from the USB flash drive. But it never loads ups on the 2013 iMac as it freezes on the Apple logo and loading bar.

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@joshdantzler - Sorry ;-{ I miss understood.

OK so we just can't get the USB drive to boot up under the installer. It is clearly hanging during the boot process so the EFI firmware is messing us up. Lets do this (hopefully on a second thumb drive) Lets setup a bootable Sierra drive this time to see if that works.

Also what is your drive/s you have in the system the original Apple units or did you add/alter your systems drives if so what did you put in make and model and type.

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@danj No worries its all good. I just wanted to make sure we are on the same page. I really appreciate you taking the time to help me. Thats means a lot.

Anyways, you are right the USB drive will not boot up under the installer on my 2013 iMac, but will on my 2015 iMac.

I have tried to setup a flash drive this time with Sierra, but I am unable to do so. I get some odd errors:

2021-05-08 18:06:23.294 createinstallmedia[6631:68005] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Couldn't posix_spawn: error 35'...and the error outputs a lot more. I have downloaded the Sierra from the link you sent me here: https://support.apple.com/en-us/HT211683 directly at this link form that page: https://apps.apple.com/us/app/macos-high...

I can make an El Capitan, High Sierra, or Mojave bootable USB just fine...so I think it's something wrong with the Sierra image. I have a feeling you can't make a bootable Sierra USB either with that download. Any ideas? Thanks.

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