Very slow boot to Windows 10 10162

Discussion in 'Windows, Linux & Others on the Mac' started by PhillB, Jul 9, 2015.

  1. PhillB macrumors newbie

    Joined:
    Feb 3, 2010
    #1
    Hi,

    I previously had my MacBook Pro (Retina, 15-inch, Mid 2014) bootcamping to Windows 7 but recently upgraded Windows 7 to Windows 10 10162. Now when I boot to Windows it starts to load with the Windows icon and circular dots but then goes to a nearly black screen for about 3 or 4 minutes before the Win10 login screen comes up. Windows 7 previously booted up pretty much instantaneously as does Yosemite 10.10.4 still.

    I've tried reinstalling the latest bootcamp drivers in Win10 but that made no difference to the boot up problem, though did load a bluetooth driver that was missing before.

    Any ideas what might be causing the long boot up pause or how to get it booting normally again?

    Thanks for any help,

    Phill.
     
  2. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #2
    If you performed an in-place upgrade (i.e. without removing the Boot Camp partition and not just reformatting the BC partition), Windows 10 will still run in BIOS-CSM, because Windows 7 was originally BIOS-CSM.

    If you had installed Windows 8.1 originally and did an in-place upgrade of Windows 10, it would have been in UEFI and way faster.
     
  3. PhillB thread starter macrumors newbie

    Joined:
    Feb 3, 2010
    #3
    Thanks for the help. I don't really know the difference between BIOS-CSM and UEFI. When I had Windows 7 installed it booted fine though, its only since upgrading to Windows 10 that I have the booting problem. It doesn't appear anything is happening during the few minutes pause, just seems to get stuck for a period when the Windows login screen normally comes up. Eventually it boots to Win 10 but with the additional 3 minutes or so pause. As the MacPro has an SSD it normally boots really fast, this doesn't seem to be just slow booting but pausing for some reason. Is there anything I can try to troubleshoot it and see what's causing the problem?

    Presumably I could install Win 10 directly from an ISO could I rather than upgrading from Win7? I don't have a copy of Win8 as didn't like it so never bought it and so am going straight from Win7 to Win 10.

    Thanks for any thoughts,

    Phill.
     
  4. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #4
    Yes you can install directly from the ISO. In order to install in UEFI, you'll have to remove the BC partition first using BCA and then recreate it. And then use BCA to do the entire setup.
     
  5. PhillB thread starter macrumors newbie

    Joined:
    Feb 3, 2010
    #5
    Thanks for this. Have just tried but when BCA repartitions back to a single Mac partition I get an error "Your disk couldn't be restored to a single partition, not really sure what to do now? Before I upgraded from Win7 to Win10 i enlarged the Windows partition with Paragon Camptune X, do you think that might be causing the problem? I looked at removing the Windows partition with Camptune X but i would only let me resize it to the minimum size rather than remove it. Any ideas how I can remove the windows partition?
     
  6. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #6
    Could be. Your best chance is to use Disk Utility to manually remove the BC partition and then drag the slider all the way down to restore the single partition.
     

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