Level 1

4 points

0x0000034 BCD Error Bootcamp, No Startup Repair

Hi! I have a late 2013 15" Macbook Pro which has been dual booted with OS X 10.11.3 and Windows 10.

After a particularly large set of Windows updates, upon restart I get an error stating that there are missing boot files (error 0x0000034). I have followed other threads and created a Windows 10 install media on an SD card, and am attempting to run Startup Repair to fix the BCD error.

However, when booting from the SD EFI icon in bootcamp, I get a message stating that it looks like I have begun an upgrade to Windows, would I like to continue the upgrade by removing the installation media, or instead perform a clean installation of Windows 10. If I remove the media, I get returned to the original blue error screen. If I attempt a clean install, I go through a few windows asking for language, input etc and then arrive at a window which asks where I want to install Windows 10.

There are 5 possible partitions available in the dialog window, and a variety of options including "Refresh" and "Format", but there is no option to run Startup Repair.

There is another icon/option that appears in bootcamp which is simply labeled "Windows". Attempting to boot from that icon gives the same results as booting from the EFI icon, but at a much lower screen resolution (everything is bigger and more jagged).

TL;DR: How do I run Startup Repair off of a bootable SD card, when Windows believes I was in the middle of an upgrade when the BCD files were lost?

Thanks in advance for the help!

Tech Specs:
Late 2013 15" Macbook Pro

OS X 10.11.3, Windows 10

2.3 GHz i7

16 GB 1600 MHz DDR3

NVIDIA GeForce GT 750M 2048 MB

500 GB Flash storage (334 GB on OS X, 164.6 GB on bootcamp partition)

MacBook Pro with Retina display, OS X El Capitan (10.11.3)

Posted on Apr 13, 2016 10:12 PM

80 replies

DietDrPhil Author

Level 1

4 points

Apr 15, 2016 12:40 PM in response to Loner T

I am currently in W10 in Safe Mode. At this point, should I create a restore point and try to install the updates?

I had to rebuild the BCD files to get to Safe Mode. I followed the actions from earlier: renaming EFI disk, running bootrec, etc, which allowed me to reach the Troubleshooting page. From there I started in safe mode.

If I restart a *second* time (after successfully getting to W10 desktop), I'm back to square 1: hang on boot, black screen. Rebuilding the BCD files allows me to boot exactly once.

DietDrPhil Author

Level 1

4 points

Apr 15, 2016 1:01 PM in response to Loner T

directory of Boot:

DietDrPhil Author

Level 1

4 points

Apr 15, 2016 1:14 PM in response to DietDrPhil

I am currently in W10 in Safe Mode. At this point, should I create a restore point and try to install the updates?

After a bunch of issues with rebuilding BCD files (see below) I somehow managed to get W10 to boot in Safe Mode. Standing by so I don't break it again.

Earlier:

Attempting to rebuild BCD files issue: entering ren y:\EFI\Microsoft\Boot\bcd bcd.old

returns "A duplicate file name exists, or the file cannot be found."

Running RebuildBcd identifies 0 Windows installations.

Initially, I had to rebuild the BCD files to get to Safe Mode. I followed the actions from earlier: renaming EFI disk, running bootrec, etc, which allowed me to reach the Troubleshooting page. From there I started in safe mode.

If I restart a *second* time (after successfully getting to W10 desktop), I'm back to square 1: hang on boot, black screen. Rebuilding the BCD files allowed me to boot exactly once.

Loner T

Level 9

59,536 points

Apr 15, 2016 1:15 PM in response to DietDrPhil

If you rebuild the BCD, please enable the F8 key as shown in http://www.thewindowsclub.com/safe-mode-in-windows-8 . If you can, from the OSX side, you can read the BCD.LOG file and look for any errors. It should helps us narrow down the issue.

Your FTL key is now in escrow, till we get you working. 😉

DietDrPhil Author

Level 1

4 points

Apr 15, 2016 1:20 PM in response to Loner T

F8 enabled. How do I read BCD.LOG from OSX?

Loner T

Level 9

59,536 points

Apr 15, 2016 1:24 PM in response to DietDrPhil

It should be in your EFI partition. You have the mount commands. Mount the EFI partition. Please also see http://superuser.com/questions/246203/utility-to-interpret-bcd-log-and-bootstat- dat-binary-files-w7-boot-hangs , but this requires a working Windows machine.

DietDrPhil Author

Level 1

4 points

Apr 15, 2016 1:42 PM in response to Loner T

Mounted. There is also BCD.LOG1 and BCD.LOG2, but Finder says they are zero bytes (I opened and showed below). Looks like LOG1 and LOG2 were from successful rebuilds earlier.

BCD.LOG:

Last login: Fri Apr 15 13:27:51 on ttys000

REDACTED:~ REDACTED$ /Volumes/EFI/EFI/Microsoft/Boot/BCD.LOG ; exit;

-bash: /Volumes/EFI/EFI/Microsoft/Boot/BCD.LOG: cannot execute binary file

logout

Saving session...

...copying shared history...

...saving history...truncating history files...

...completed.

Deleting expired sessions...15 completed.

[Process completed]

BCD.LOG1:

Last login: Fri Apr 15 13:40:01 on ttys001

REDACTED:~ REDACTED$ /Volumes/EFI/EFI/Microsoft/Boot/BCD.LOG1 ; exit;

logout

Saving session...

...copying shared history...

...saving history...truncating history files...

...completed.

[Process completed]

Loner T

Level 9

59,536 points

Apr 15, 2016 1:51 PM in response to DietDrPhil

If your MBR or Boot Sector is corrupted, you can get to Safe Mode and use Bootrec.exe to /fixMBR and /fixBoot and test. Try a /scanOS first to check if it recognizes the installation.

DietDrPhil Author

Level 1

4 points

Apr 15, 2016 2:01 PM in response to Loner T

/ScanOs returns that it identified 0 Windows installations

Loner T

Level 9

59,536 points

Apr 15, 2016 2:03 PM in response to DietDrPhil

Did you assign a drive letter to the EFI partition before /scanOS?

DietDrPhil Author

Level 1

4 points

Apr 15, 2016 2:06 PM in response to Loner T

Yes. Input: X:\Windows\System32>bootrec /ScanOs

FYI: Letter assigned to EFI is Y:

DietDrPhil Author

Level 1

4 points

Apr 15, 2016 2:30 PM in response to Loner T

Should I run /fixMBR and /fixBoot?

Only thing I'm worried about is screwing up the GPT format by running fixMBR

Loner T

Level 9

59,536 points

Apr 15, 2016 2:29 PM in response to DietDrPhil

If you can see both Y: and C: and rebuild BCD, the scanOS should find the C: Windows installation. Do you get any error messages?

Loner T

Level 9

59,536 points

Apr 15, 2016 2:29 PM in response to DietDrPhil

DietDrPhil wrote:

Should I run /fixMBR and /fixBoot?

Yes, you can. It should not cause any new issues.

DietDrPhil Author

Level 1

4 points

Apr 15, 2016 2:32 PM in response to Loner T

No error messages. About to run fixMBR and fixBoot

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0x0000034 BCD Error Bootcamp, No Startup Repair