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I've had a similar issue and managed to solve it by repairing the NVRAM entry. Maybe it helps: https://ask.fedoraproject.org/en/question/106803/grub-not-found-after-re-plugging-the-hard-drive/

I've had a similar issue and managed to solve it by repairing the NVRAM entry. Maybe it helps: https://ask.fedoraproject.org/en/question/106803/grub-not-found-after-re-plugging-the-hard-drive/entry: https://ask.fedoraproject.org/en/question/106803/grub-not-found-after-re-plugging-the-hard-drive/ I'm assuming that you have UEFI rather than BIOS. In this case, here is what I did:

  1. Run Fedora from a Live USB stick.
  2. Open a terminal and run efibootmgr -v to show the boot entries.
  3. Mount the EFI boot partition somewhere and check whether the files related to Fedora (especially shim.efi, but also GRUB etc.) are present.
  4. If the entry for Fedora is missing, but the files on the EFI partition are present, you can add the boot entry using efibootmgr (see the thread linked above). Check out man efibootmgr first and make sure you entered the correct drive and partition.