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How to make the system bootable again

Check that

  • all partitions are listed in the partition table
  • a partition with your computer OS is listed as *(bootable)
  • you can list the files from the bootable partition

DOS - Window 95/98

If your OS doesn't boot, you can reinstall the system files with :command:`sys c:`.

Windows 2000/XP/2003

  • Run :command:`fixmbr` from the Recovery Console
fixmbr \Device\HardDisk0

If you still have the problem,

  • Run :command:`fixboot` to repair NTFS boot sector.
  • Check :file:`c:\\boot.ini` content

Windows Vista/Windows 7/..., Windows Server 2008/...

  • Run :command:`bootrec.exe /fixmbr` from the Recovery Console
  • For legacy / PC Intel partition table, check :file:`c:\\boot.ini` content
  • For EFI GPT, check the output of :command:`bcdedit /v`. To modify the settings, use the :command:`bcdedit /set` command.
  • Run :command:`bootrec.exe /fixboot` to repair NTFS boot sector.

Boot Windows in safe mode or from a Windows DVD (Not the DVD from the computer manufacturer) as described in https://support.microsoft.com/en-us/windows/start-your-pc-in-safe-mode-in-windows-92c27cff-db89-8644-1ce4-b3e5e56fe234 and select

  • Troubleshoot
  • Advanced Options
  • Command Prompt
  • Run :command:`chkdsk /f c:` to check an repair the filesystem
  • If it doesn't solve the boot problem, try Startup Repair.

Linux/FreeBSD

  • Update your :file:`/etc/fstab` to reflect the new partition order.

  • Update your multiboot configuration

    • Lilo: :file:`/etc/lilo.conf`
    • Grub: :file:`/boot/grub/grub.conf`
    • Grub2: :file:`/etc/grub2-efi.cfg`

  • Reinstall the multiboot in the Master Boot Record.

lilo
grub-install device
grub2-install device