enikibenik
Level 1 (8 points)
Windows Software

Q: Windows 10 (bootcamp) won't boot after SMC/NVRAM reset on Mac.

Blue screen appears every time I try to start up windows 10 on my mac. I think it's because of SMC and NVRAM reset I've done lately. Blue screen contain message like this:


"the boot configuration data file is missing some required information.

 

file:\BCD

error code: 0xc0000034"


When I try to enter recovery options - nothing happens. The blue screen even doesn't contain text about F8 command to enter recovery or enter command to reboot.


With installation media (same usb stick that I used to install win10) the same blue screen appears no matter what I choose : EFI Boot, Windows both from USB stick or from bootcamp drive. But now blue screen allows F8 and enter command but when I try them the screen just blinks and turn me back to the blue screen. I can't access recovery options.


In addition I should say that first time I tried to boot windows lately there was a message that windows can't start properly and it allows me to try automatic startup repair - but it won't help me. I didn't know what to do next so I reboot to MAC to google it up but after this first time only blue screen with error code appears when I try to start windows.


Could you, guys, please, help me?




MacBook Pro with Retina display, OS X El Capitan (10.11.5), Windows 10

Posted on Jun 12, 2016 2:21 AM

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enikibenik

Q: Windows 10 (bootcamp) won't boot after SMC/NVRAM reset on Mac.

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  • Helpful answers

  • by Oso Grande,

    Oso Grande Oso Grande Jun 12, 2016 1:27 PM in response to enikibenik
    Level 1 (124 points)
    Mac OS X
    Jun 12, 2016 1:27 PM in response to enikibenik

    I don't think it has anything to do with EFI, especially if OS X was able to boot fine. I can't say what it is but it doesn't sound like an EFI problem, especially if you can reach the boot manager (holding down Option at boot).

     

    I would download a new(er) ISO of Windows 10, create new media, and boot from it.

    https://www.microsoft.com/en-us/software-download/windows10ISO

     

    Worst-case scenario: If you can't get into Safe Mode at all, you may have to rebuild the boot camp partition altogether. Use the Boot Camp Assistant to nuke the partition, then use it to create a new one. You can point it to the ISO file, and Boot Camp Assistant will install directly from it (without the need of a USB drive).

     

    Also, FYI: If you see a blue screen after installing Windows 10 on your MacBook, MacBook Air, or MacBook Pro - Apple Support

  • by Loner T,

    Loner T Loner T Jun 13, 2016 3:41 AM in response to enikibenik
    Level 7 (23,493 points)
    Safari
    Jun 13, 2016 3:41 AM in response to enikibenik

    SMC and NVRAM resets rebuild the hardware database and remove NVRAM parameters. Your error is BCD corruption. On 2015 and later Macs, the Windows boot-manager and BCD are stored in the Microsoft directory in the EFI partition.

     

    Please see Re: Can't resize Macintosh HD partition as an example.

     

    You will need to use bootrec.exe and /rebuildBCD as documented in https://support.microsoft.com/en-us/kb/927392 .

  • by enikibenik,

    enikibenik enikibenik Sep 4, 2016 10:25 AM in response to Loner T
    Level 1 (8 points)
    Windows Software
    Sep 4, 2016 10:25 AM in response to Loner T

    I left this problem undone for couple of months but now I need windows again so I return to it. And something changed. I done nothing with my problem yet but now when I do restart and press option and then choose to boot windows - nothing actually happens. Only bootcamp screen freezes for minutes and then it turns to black but machine is still powered on. I need to press and hold power button to turn it off.
    After realising this I tried to boot from Windows installation USB flash drive, but it doesn't appear in boot menu after restart. I actually don't know what to do next...

  • by Loner T,

    Loner T Loner T Sep 4, 2016 10:44 AM in response to enikibenik
    Level 7 (23,493 points)
    Safari
    Sep 4, 2016 10:44 AM in response to enikibenik

    If you have Windows Automatic Updates enabled, on Macs with Intel GPUs, W10 is notorious for pushing broken drivers. If W10 does not start properly three times, it invokes the Repair setup. Since you see a black screen, it may just be brightness/contrast settings.

     

    1. Does this happen with and without battery being the main source of power?

    2. If you connect an external monitor, does the external monitor show proper display?