Bootmgr is Missing: Troubleshooting and Solutions
The "Bootmgr is Missing" error is a common problem that prevents your Windows operating system from starting. It indicates that the Boot Manager, a small piece of software responsible for loading the operating system, cannot be found. This can be caused by various factors, including corrupted boot files, incorrect boot order in the BIOS, a damaged hard drive, or even a loose cable.
Common Causes and Initial Checks
Before diving into complex solutions, let's rule out some basic issues:
- Check Boot Order in BIOS/UEFI: Ensure your hard drive containing the operating system is the first boot device. Access the BIOS/UEFI setup by pressing Del, F2, F12, or Esc (key varies by manufacturer) during startup.
- Check Cables: Verify that the SATA or IDE cable connecting your hard drive to the motherboard is securely connected at both ends. A loose connection can prevent the system from detecting the drive.
- Check for External Media: Remove any USB drives, CDs, or DVDs. Sometimes, the system tries to boot from these before the hard drive, leading to the error.
Advanced Solutions to Fix Bootmgr is Missing
If the initial checks don't resolve the issue, you'll need to use Windows installation media (DVD or USB) to repair the boot files. You'll need access to another working computer to create this media if you don't already have it.
- Boot from Windows Installation Media: Insert the Windows installation media and boot from it. You might need to adjust the boot order in the BIOS/UEFI again.
- Access the Repair Environment: On the "Install Windows" screen, click "Repair your computer."
- Use Startup Repair: In the System Recovery Options menu, select "Startup Repair." This tool automatically scans for and fixes boot-related issues. This process can take between 15-45 minutes.
- Use the Command Prompt (if Startup Repair fails): If Startup Repair doesn't work, select "Command Prompt." Type the following commands, pressing Enter after each:
bootrec /fixmbr(Writes a new Master Boot Record)bootrec /fixboot(Writes a new boot sector)bootrec /scanos(Scans for installed operating systems)bootrec /rebuildbcd(Rebuilds the Boot Configuration Data)
- Restart your computer: After running these commands, restart your computer and see if the error is resolved.
If none of these solutions work, the problem might be a failing hard drive. Consider running a hard drive diagnostic tool to check for errors. If errors are found, you may need to replace the hard drive.