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Windows ne démarre plus après le changement de CMS à UEFI

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Anakin252 Posted messages 15 Status Member -  
flo88 Posted messages 28509 Registration date   Status Contributor Last intervention   -

Hello, I changed my hard drive from an MBR partition to a GPT SSD, so I also switched my BIOS from CMS to UEFI, but now, even if I go back to CMS, Windows won't boot anymore. I'm stuck in the BIOS or on a black screen.

4 answers

  1. Anonymous user
     

    Hello,

    CSM is the legacy mode for MBR; if you have switched to GPT, you need to disable it to have true UEFI.

    What’s the issue? I don’t see any.

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    1. Anakin252 Posted messages 15 Status Member
       

      The problem is that the PC doesn't start with the OS and I have set the recovery action to Start with the OS but my PC boots to a black screen.

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    2. Anonymous user > Anakin252 Posted messages 15 Status Member
       

      You're not very clear either... What are your other storage locations? Where is Windows?

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    3. Anakin252 Posted messages 15 Status Member > Anakin252 Posted messages 15 Status Member
       

      Windows is still on my hard drive

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    4. Anonymous user > Anakin252 Posted messages 15 Status Member
       

      So what do you want to do? If the hard drive is MBR, you won't be able to boot in UEFI; this concerns the system disk and the partitioning problem for the BIOS. Putting the SSD in GPT is pointless because it's not the system. You need to focus on the hard drive under Windows and use your SSD as "non" system secondary storage.

      I don't see the point of an SSD if it's only used for the hard drive for Windows... Anyway.

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    5. Anonymous user > Anakin252 Posted messages 15 Status Member
       

      Sometimes the NVMe SSD disables SATA ports where hard drives can be connected, you need to change the connection at that point.

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  2. ruby
     

    Hello

    Maybe there are more Windows.

    You need to install Windows or Linux Mint if you want, but in UEFI on the SSD.

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    1. Anonymous user
       

      Damn, it's true, he might not have installed or cloned Windows, that's so stupid.

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  3. Anonymous user
     

    Is your hard drive still recognized in the BIOS of your Windows system? Maybe you made a mistake and deleted Windows when changing your SSD from MBR to GPT.

    The best solution would be to install Windows on your new SSD, but make sure to disconnect the hard drive to avoid putting the bootloader on it instead of the SSD.

    If not, to diagnose what actually happened to your Windows, use the malekal LiveUSB and check its partitions and status with the appropriate software.

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    1. Anakin252 Posted messages 15 Status Member
       

      My discs are well recognized and I will try

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  4. flo88 Posted messages 28509 Registration date   Status Contributor Last intervention   Ambassador 5 176
     

    Hello

    What exactly did you want to do? It's true that we don't quite understand.

    I'll lay down a few "milestones"

    If your OS was in MBR, it means you're on Windows 10 or earlier. The only (main) reason to switch from MBR to GPT is to install Windows 11.

    So, if the process was to prepare for the transition to Windows 11, you first need to convert the HDD/SSD from MBR to GPT; on Windows 10, this can be done using a tool available in PowerShell: MBR2GPT

    Then switch the BIOS from CSM to UEFI.

    Next, if necessary, clone the SSD/HDD to another one.

    Finally, install Windows 11 using the upgrade tool provided by Microsoft.

    This order must be followed.

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