Windows 10: Multiboot system does another bios boot when selecting non-default OS

Discus and support Multiboot system does another bios boot when selecting non-default OS in Windows 10 Support to solve the problem; Multiboot system with Windows 7 on 1st partition and Windows 10 on 2nd partition-same drive. Using the fancy blue Bootmanager Selection screen that... Discussion in 'Windows 10 Support' started by mdmike52, Sep 13, 2015.

  1. mdmike52 Win User

    Multiboot system does another bios boot when selecting non-default OS


    Multiboot system with Windows 7 on 1st partition and Windows 10 on 2nd partition-same drive. Using the fancy blue Bootmanager Selection screen that comes with win10. Win 10 is the default OS. If I select windows 7 from the bootmanager selection screen the system does a complete bios reboot then goes directly into windows 7. Selecting windows 10 does not do this reboot, just starts win 10 as would be expected. Is this normal?? I have had Multiboot with Win 7 and XP and do not remember this happening.
    FYI
    Win7 partition is marked "Active" (first partition on drive) bootmgr file is on this drive I think
    Win10 partition is marked "Inactive" (second partition on drive)
    Tried turning off Fast Boot in Win 10 == No Help

    Any ideas?? Its annoying and time consuming to go through another complete bios boot up every time I select my Win 7 OS.
    Any help will be greatly appreciated
    Mike

    :)
     
    mdmike52, Sep 13, 2015
    #1

  2. How to Dual Boot Windows 10 with Other Versions of Windows, macOS and Linux

    I dual boot XP at home and at work into Windows 10 (work which is a pre-release build) and Windows 8.1 here at home (XP/8.1) I can use the keyboard and the mouse if I choose to select OS. When you have the newer build selected as default, it boots not
    out of BIOS but another system, so BIOS does not matter at that point. Only XP boots using older BIOS settings. In other words, Windows 8.1 and 10 boot using UEFI When you are in the BIOS you might look at the boot scheme to see how it is booting. Here
    is a link to explain the two. What is the difference in "Boot with BIOS" and "Boot with UEFI"

    When I boot my computer at work it boots first into the Windows 10 menu and if I don't choose the "earlier operating system" it continues on into Windows 10. If I do choose "Earlier Operating System" then it basically shuts down all the way into the BIOS
    and then the only screen that comes up then is the XP boot loader giving a choice of Windows XP or other OS. The 2 different boots look entirely different.
     
    Vernon Jenewein, Sep 13, 2015
    #2
  3. HairyFool Win User
    Is it possible to reinstall Windows 10 and completely reset UEFI options

    Setting up multiboot should not have required any changes to the BIOS settings. In a mutiboot environment all the BIOS does is hand boot control to the hard disk exactly the same as with a single O/S, it is the boot code on the hard disk (the Grub Loader
    if the second O/S in Linux) that handles choosing which actual O/S is loaded by default and giving you the choice within a timeout.

    The alternative would have been if you had two hard drives and installed each O/S on their own drive with the other disk disconnected. That is strictly speaking not a multiboot system and in that case you would have to tell the BIOS which disk to boot from
    to get a specific O/S.

    As your computer successfully boots Windows at the moment the next step is to boot from your chosen distribution media for Linux and tell it to install it to the hard disk leaving the current O/S intact and to install the Grub Loader.
     
    HairyFool, Sep 13, 2015
    #3
  4. mdmike52 Win User

    Multiboot system does another bios boot when selecting non-default OS

    Found the problem. It was the fancy new boot manager selection screen that comes with windows 10. The blue one with the different available OSs in big boxes. Going back to the original black and white Boot manager selection screen solved the problem, goes right into Windows 7 now without the extra system boot. To get back to the old B/W menu run Command Prompt Administrator and type:
    "bcdedit /set {default} bootmenupolicy legacy

    To go back to the Blue Fancy Screen type:
    "bcdedit /set {default} bootmenupolicy standard"
     
    mdmike52, Sep 19, 2015
    #4
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Multiboot system does another bios boot when selecting non-default OS

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