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macOS Sierra won't boot (bootcamp win10)

Hello, community.

I really hope you can help me. I've searched the internet thin for answers with no luck. Please.

I'm running a Macbook Pro Retina 15" 2013 with macOS Sierra + bootcamp windows 10. The macOS partition is the default boot up partition.

My Problem

When booting up it goes directly to BSOD (0x0000000e) in Windows 10. When trying to POWER + ALT it only shows Windows. Macintosh HD (macOS Sierra) is not visible.

How I got into the Problem

I installed Windows 10 (bootcamp) before upgrading to macOS Sierra. Everything worked fine until I wanted to increase the harddisk size of the Windows partition. I used the Disk Utility to decrease the size of the Mac partition, which resulted in xx GB of unused space.

I then booted up Windows only to find that I was not able to allocate that unused space to Windows (using Partition Wizard).

I thought it was due to the fact, that the unused space wasn't formatted. I then formatted it (FAT) and this is where everything went sideways. My Mac went directly into Win10's BSOD when I restarted it.

What I have done to fix it

I tried to use CMD + R when booting, only to have limited options:

  • Press Apple icon and choose Disk to boot from (don't remember the name): It shows me the two partitions: Mac and Windows. It asks for a password to decrypt the Mac option, when I choose it. After entering the password it vanishes and only the Windows option is left.
  • Trying to reinstall OSx: Since macOS Sierra is a later version than the Recovery Mode's El Capitan, it won't progress.

To be able to write this post, I've plugged in my Windows 10 install USB, formatted the Windows partition and reinstalled Windows 10. This has worked. When pressing POWER + ALT it now shows two Windows options. The new (working) one and the old (BSOD/unusable) one.

What should I do?

How do I boot into macOS? And how do I remove the second (old) windows option when POWER + ALT?

Thank you SO very much for taking the time to read my post. I really do appreciate it! :-)

Sincerely,

Oliver C.

Answered! View the answer I have this problem too

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Of course you did a Time Machine backup of your hard drive BEFORE you installed a BETA system that's in beta because it has unknown bugs, right? Just do a restore from your backup. Only professionals and developers or others with a valid reason should ever use beta versions and never on their primary machines.

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Thank you for your quick reply, Mayer!

No. I'm afraid I don't have a backup.

Yes. I've learned a lesson.

Yes. I'll do backups in the future.

How should I proceed from this stupid position?

--- Worst case, I'll be OK with a fresh clean OSx install. All my important data is in the cloud anyway.

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A couple of options. Think about upgrading your SSD using an OWC Envoy Pro . https://eshop.macsales.com/item/OWC/MAU3...

Do an internet install of 10.11.6. Then hook up your old drive using the Envoy (you will later use this drive for a Time Machine backup drive. Migration assistant will probably not work as you would be trying to move from a newer to an older system. But you could drag and drop, then add your old user.

Here's the 1TB option: https://eshop.macsales.com/item/OWC/SSDA...

Here are available lessor options: https://eshop.macsales.com/Search/?Ntk=P...

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Thank you once again for your answers.

I'm not sure I'm competent enough to fully understand your answer.

Is there a way to do a clean reinstall of the Mac OS without having 3rd party accessories? As dumb as it sounds, this is my only workstation and getting it up and running as fast as possible is better than retrieving the old data.

I hope you understand. I appreciate your help very much :-)

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See if you can boot into Recovery Mode. Then erase the drive partition. See if you can then reinstall;; 10.11.6. Let me know if that fails. If it does fail you need to get that drive wiped, either in Target Mode with another machine or using the Envoy Pro and another machine. You can then do an install either from the other machine or via the internet.

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When you have your Mac up and running, I'd use Parallels to run Windows.

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Off topic, but I have a question on the Parallels recommendation - I used Parallels years ago then switched to Fusion. Parallels converted all my windows files to have Parallels icons which didn't revert back after uninstalling it. Any ideas? And today is Fusion or Parallels better?

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Apple breaks the UEFI partition while installing Sierra, use this guide to repair the UEFI boot loader in windows that the Sierra installation broke, be sure to follow the guide that corresponds to your version of Windows.

https://neosmart.net/wiki/fix-uefi-boot/...

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olivercurting will be eternally grateful.
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