Level 1

8 points

Unable to install Windows 10

I have a late 2014 iMac and have been trying to install Windows on it.

Bootcamp wouldn't make a bootable USB with the October 2018 update, but it did with the April 2018 update. Everything seems to work fine until it reboots and tries to restart in Windows. I just get the SYSTEM_SERVCIES_EXCEPTION stop code with "What failed: win32kfull.sys"

I have also tried to reboot by pressing the option key on startup. When I choose the "EFI" option, it gives me the same BSOD. When I choose "Windows" it takes me to Windows setup but it tells me that the partition is the wrong format, and that it's a GPT partition. I can format the drive to NFTS, but the GPT error remains.

I've tried erasing and remaking the partition without bootcamp, but it doesn't work.

Any thoughts or solutions?

iMac with Retina 5K display, macOS 10.14

Posted on Apr 25, 2019 9:58 AM

Top-ranking reply

Loner T

Level 9

59,536 points

Posted on May 26, 2019 8:34 PM

Download and install GPT FDisk from https://sourceforge.net/projects/gptfdisk/ .

Rebuild MBR to match the new GPT information thus resetting the Hybrid MBR. Use defaults for other questions (like partition codes). The only values that need modifications are the Boot flags and step 10. Accept all other defaults that Gdisk offers. Please see thesample Q&A as an example. These steps can be repeated if you make a mistake before you get to Step 12, otherwise start from Step 1 for these steps. Step 6 has numbers which are typed with a space between the numbers. Please see the sample Q&A before you execute these steps.

Sudo gdisk /dev/rdisk0
P (Print list of parts)
R (Recover)
O (print current Hybrid MBR)
H (chooses Hybrid)
Partitions numbers to be hybridized: 2 3
Y (Good for GRUB question)
N (part 2 boot flag)
Y (part 3 boot flag make NTFS bootable partition)
O (print current Hybrid MBR)
W (Write the new MBR)
Y (Yes! write the new MBR)
Reboot

Here is sample Q&A for this section. Please notice the Press Enter/Return.

Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): Y

Creating entry for GPT partition #2 (MBR partition #2)

Enter an MBR hex code (default AF): Press Enter/Return

Set the bootable flag? (Y/N): N

Creating entry for GPT partition #3 (MBR partition #3)

Enter an MBR hex code (default 07): Press Enter/Return

Set the bootable flag? (Y/N): Y

Test 1 - Does Bootcamp Volume show up in Finder?

Test 2 - Can you see files in Bootcamp Volume?

Test 3 - Can you select Bootcamp in System Preferences -> Startup Disk?

Test 4 - If Test 3 is successful, select Bootcamp and Click Restart.

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73 replies

Loner T

Level 9

59,536 points

May 12, 2019 5:24 PM in response to Ananbe

Does Windows boot properly when you use System Preferences -> Startup Disks?

Loner T

Level 9

59,536 points

May 21, 2019 2:11 AM in response to Ananbe

Since you installed Windows using Yosemite and non-EFI Boot, you need a MBR, which is missing. Can you see your Windows files in macOS Finder?

Loner T

Level 9

59,536 points

May 26, 2019 7:45 PM in response to Ananbe

Can you the same for the 1TB HDD? What you have posted is the SSD, which does not have the Windows partitions.

Use disk1 instead of disk0 in the command.

Loner T

Level 9

59,536 points

May 27, 2019 1:16 PM in response to Ananbe

We either need GPT Fdisk or gpt in Recovery to fix disk1 and remove the MBR.

Ananbe Author

Level 1

8 points

Apr 25, 2019 5:22 PM in response to Loner T

No version of Windows that I've tried has installed correctly. I've only managed to get the April 2018 update to make a bootable drive. The October one gave me an error in bootcamp and the apple support page suggested using April, then updating.

Ananbe Author

Level 1

8 points

May 20, 2019 10:48 PM in response to Loner T

Hi, sorry for the delay. Here's the output from the command

Disk: /dev/disk0 geometry: 14751/255/63 [236978176 sectors]

Signature: 0xAA55

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

------------------------------------------------------------------------

1: EE 1023 254 63 - 1023 254 63 [ 1 - 236978175] <Unknown ID>

2: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

Ananbe Author

Level 1

8 points

May 26, 2019 7:40 PM in response to Loner T

gpt show: /dev/disk0: mediasize=121332826112; sectorsize=512; blocks=236978176

gpt show: /dev/disk0: PMBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 236978175

start size index contents

0 1 PMBR

1 1 Pri GPT header

2 32 Pri GPT table

34 6

40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

409640 236568496 2 GPT part - 7C3457EF-0000-11AA-AA11-00306543ECAC

236978136 7

236978143 32 Sec GPT table

236978175 1 Sec GPT header

Ananbe Author

Level 1

8 points

May 26, 2019 11:26 PM in response to Loner T

Ok. I did it. When I rebooted to Mac, I just go the prohibitory symbol. But at least I can boot to Windows now?

I went into recovery and tried to repair the disk, the only one available to repair was the SSD. Should I reinstall MacOs?

Also, it's really strange but the files and applications I had downloaded earlier for Windows are gone now. It's not a big deal but it's strange because I didn't think they'd get deleted.

Loner T

Level 9

59,536 points

May 27, 2019 6:58 AM in response to Ananbe

Ananbe wrote:

Ok. I did it. When I rebooted to Mac, I just go the prohibitory symbol. But at least I can boot to Windows now?

I went into recovery and tried to repair the disk, the only one available to repair was the SSD. Should I reinstall MacOs?

Can you post the output of sudo fdisk /dev/disk0 ? This should not be the case.

Also, it's really strange but the files and applications I had downloaded earlier for Windows are gone now. It's not a big deal but it's strange because I didn't think they'd get deleted.

None of your Windows content should be changed, between the original Yosemite installation and the current Mojave state.

Ananbe Author

Level 1

8 points

May 27, 2019 7:30 AM in response to Loner T

None of your Windows content should be changed, between the original Yosemite installation and the current Mojave state.

I realize it doesn't make sense but everything I had installed or downloaded (like Chrome, MS Office, etc.) are all gone now.

Loner T

Level 9

59,536 points

Apr 25, 2019 2:28 PM in response to Ananbe

Are you running macOS Mojave (10.14.x)?

Ananbe Author

Level 1

8 points

Apr 25, 2019 5:52 PM in response to Loner T

No. I haven't been able to go beyond making the bootable USB.

Windows used to be installed when my friend owned the iMac, but removed it before I got it.

Ananbe Author

Level 1

8 points

Apr 26, 2019 8:57 AM in response to Loner T

Yes created by BCA, and yes it's USB2.

Ananbe Author

Level 1

8 points

Apr 26, 2019 7:41 PM in response to Loner T

I tried it. I got the same BSOD.

Ananbe Author

Level 1

8 points

Apr 26, 2019 10:27 PM in response to Loner T

I just tried 1607 and 1511. Both still gave me the same error.

Is it really a Windows issue? Could there be something with a recent Mac update?

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Unable to install Windows 10