How To Fix BOOTMGR is Missing Error
The "BOOTMGR is missing" error displays shortly after the computer is turned on, immediately after the Power On Self Test (POST) is complete.

There are a number of possible causes for BOOTMGR error message.


How To Fix BOOTMGR is Missing Errors


1. Often times, the "BOOTMGR is Missing" error will appear if your PC is trying to boot to a non-bootable disc, external drive, or floppy disk. You might want to consider changing the boot order in BIOS so the hard drive where Windows is installed is listed as the first boot device.

2. Run Startup Repair (Automatic Repair) from Windows Recovery Environment (WinRE).

3. Rebuild the boot configuration data (BCD) from Windows Recovery Environment (WinRE).

To rebuild the boot configuration data (BCD) from Windows Recovery Environment (WinRE), follow these steps:

Launch the Command Prompt from WinRE and execute following command:

Code:

Bootrec /RebuildBcd


Restart your computer.

4. Run System Restore from Windows Recovery Environment (WinRE).

5. Reseat all internal data and power cables. BOOTMGR error messages could be caused by unplugged, loose, or malfunctioning power or controller cables.

6. If the partition boot sector becomes corrupted or misconfigured in some way, Windows will not be able to start properly, prompting an error like BOOTMGR is Missing very early in the boot process.

To write a new partition Boot Sector from Windows Recovery Environment (WinRE), follow these steps:

Launch the Command Prompt from WinRE and execute following command:

Code:

bootrec /fixboot


Restart your computer.

7. If all else has failed, including the clean installation, you're most likely facing a hardware issue with your hard drive.