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I have a Lenovo P330 Thinkstation. This SSD it shipped with runs Win 11. I wanted to experiment with Linux, so I installed an M.2 SSD and put first Mint and and then Ubuntu on it. I booted via GRUB. I then removed the M.2 drive, and changed the boot disk order in BIOS, but I was unable to boot into Win 11. Reinstalling the M.2 drive didn't fix the problem. I also changed some of the BIOS settings (CSM, secure boot) according to online help instructions elsewhere. Those changes didn't fix the problem. I think I have returned the BIOS settings to what they were before I removed the M.2 drive.

I thought, naively, removing the M.2 drive would force the machine to boot via the original SSD with Windows on it (I have a very cursory and clearly inadequate understanding of GRUB). I need to access the SSD with Win 11 on it. The M.2 with the two Linux distros is expendable. Would reinstalling one of the Linux distros over the existing two fix the problem? If not, I would appreciate suggestions as to how I can successfully boot into Windows. I did see this question, but I think my situation is a bit different, hence my question.

My current BIOS settings are:
CSM: Enabled
Boot Mode: Auto
Boot Priority: UEFI First
Secure Boot: Disabled

I see a message about error 1962 (no operating system found) after the Lenovo splash page.

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  • You will not be able to boot Windows 11 with SecureBoot disabled, you have to enable that before booting Windows 11. Also disable CSM, that is not necessary.
    – Esther
    Jun 24, 2022 at 21:58
  • You're also not trying to boot into GRUB, but rather into Windows, as it seems. You should be able to boot Windows through GRUB, by booting into the Linux install, running sudo os-prober and then sudo update-grub and choosing Windows from the GRUB menu. You have to do this from within the Linux distro that is currently supplying GRUB.
    – Esther
    Jun 24, 2022 at 22:01
  • Thanks for the quick replies. Changing to a secure boot didn't help. Also, to clarify, I can't even get to a boot menu. All is see is a message about error 1962 (see above) after the Lenovo splash page.
    – BruceM
    Jun 24, 2022 at 22:03
  • try selecting boot device in BIOS, does either drive appear there? Can you boot to a live USB and check on the drives that way?
    – Esther
    Jun 24, 2022 at 22:05
  • Also, your Linux may have installed GRUB to the boot partition of Windows, which means you can either boot into GRUB and boot windows from there, or reinstall the Windows boot loader. You may also need to create a Windows live USB and repair Windows from it
    – Esther
    Jun 24, 2022 at 22:08

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