Windows 10: Need help in changing BIOS settings from legacy boot to UEFI boot. Solved

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  1.    02 Nov 2017 #1

    Need help in changing BIOS settings from legacy boot to UEFI boot.

    After running MBR2GPT on my system with a successful completion, I realized that I don't know how to change the BIOS from legacy to UEFI, resulting in the inability to boot the GPT'ed system. I was running Windows 10 Creator on an MBR system using an MSI H61M-E23 (version 2) motherboard. I made the mistake of thinking that setting the boot mode to UEFI would be easy - I tried setting the first boot device to UEFI, but that did not work. The system does not boot - all I get is a blinking cursor. Any help would be appreciated.
      My ComputerSystem Spec

  2.    02 Nov 2017 #2

    Look for a setting to enable/disable CSM mode and disable it.
      My ComputerSystem Spec

  3. Posts : 2,430
    Ubuntu14.04x64 MintMate17x64 Win10Prox64
       02 Nov 2017 #3

    Hit DEL to enter the BIOS, go to Boot tab, set the UEFI-HD/SSD id in box 1. Set "Windows Boot Manager" in box 2. Hit F10 to save and exit.
    Click image for larger version. 

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      My ComputerSystem Spec

  4.    02 Nov 2017 #4

    First, thank you for your quick responses. Unfortunately, neither response provides me with a solution.

    There is no CSM mode provided in my version of the BIOS (Aptio setup utility).

    The options menu provided for Boot Configuration are: USB Hard Disk, Hard Disk: Sandisk Ultra II, USB CD/DVD, USB floppy, Network, Bev, UEFI, Disabled. I have no choice of 'UEFI-HD/SSD' (1), only 'UEFI'. And I do not have 'UEFI Boot Drive BBS Priorities', instead the only choice I have is 'CD/DVD Rom Drive BBS Priorities'. BTW, when I choose 'UEFI' for 1st boot, at boot, the system flashes the logo and returns to the BIOS's main menu. I have the same version of the Aptio setup utility (version 2.10.1208) and my Bios Version is E7680IMS V10.14.

    Even though the MBR2GPT utility presented a successful completion, now I am questioning that. Is there some sort of 'offline' validation of the GPT'ed system that I can perform ??
      My ComputerSystem Spec

  5.    02 Nov 2017 #5

    You can boot the computer from a recovery USB flash drive like Kyhi's recovery tools and we can look at the disk layout.
      My ComputerSystem Spec

  6.    02 Nov 2017 #6

    While waiting for a response, I brought up Diskpart to take a look at the partition layout and noticed when doing a 'detail disk' on the system disk, 'Boot Disk' was flagged as NO in the provided information. I will take your suggestion re Kyhi's recovery USB.

    Can I use diskpart to set the EFI partition as active ?????
      My ComputerSystem Spec

  7. Posts : 2,073
    Windows 7 Pro x64 Windows 10 Pro x64
       02 Nov 2017 #7

    Why did you change it ? There was no need to.
      My ComputersSystem Spec

  8. Posts : 3,459
    3-Win-7Prox64 2-Win10Prox64
       02 Nov 2017 #8

    NavyLCDR said: View Post
    Look for a setting to enable/disable CSM mode and disable it.
    Not an expert as you but disabling CSM I'm pretty sure will make a system not boot anymore :/
      My ComputersSystem Spec

  9.    02 Nov 2017 #9

    This question is for AddRam - I'm not sure what your question addresses. Did I change what ?

    As for ThrashZone, The BIOS setup utility does not even mention CSM.
      My ComputerSystem Spec

  10.    02 Nov 2017 #10

    ThrashZone said: View Post
    Not an expert as you but disabling CSM I'm pretty sure will make a system not boot anymore :/
    Disabling CSM mode only disables booting from legacy BIOS MBR partitioned drives. It forces booting in UEFI more only.

    And on a GPT drive for UEFI booting, there should be an EFI System Partition that is formatted as FAT32 to boot from, but therr is no active partition.
      My ComputerSystem Spec

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