BOOTMGR error message appears

BOOTMGR issues apply to Windows operating systems only.Windows XP does not utilize BOOTMGR. 


  •  First try to Restart the computer. The BOOTMGR error could be a fluke.
  • Then Check your optical drives, USB ports, and floppy drives for media. Often times, the "BOOTMGR is Missing" error will appear if your PC is trying to boot to a non-bootable.
  • If you find that this is the cause of your issue and it's happening regularly, you might want to consider changing the boot order in BIOS to the hard drive is listed as the 1st boot device.
  • Check the boot sequence in BIOS, Make sure the correct hard drive or other bootable device is listed first, assuming you have more than one drive.
  • Those are the troubleshooting steps, make sure specifically that you might have the wrong hard drive listed, as many BIOS/UEFI systems allow you to specify a particular hard drive to be booted from first.
  • Reseat all internal cables. BOOTMGR error messages could be caused by unplugged, loose, or malfunctioning power or controller cables.
  • Try replacing the SATA cable if you suspect it might be faulty.
  • Perform a Startup Repair of Windows. This type of installation should replace any missing or corrupt files, including BOOTMGR.
  • Even though a Startup Repair is a common solution for BOOTMGR problems, don't worry if it doesn't fix your problem. Continue troubleshooting - something will work.
  • Write a new partition boot sector to the Windows system partition to correct any possible corruption, configuration problem, or any other damage.
  • The partition boot sector is an important piece in the boot process, so if there's any issue with it, you'll see problems like "BOOTMGR is missing" errors.
  • Rebuild the Boot Configuration Data (BCD). Similar to the partition boot sector, a corrupted or incorrectly configured BCD could cause BOOTMGR error messages.
  • Please NOTE: The following troubleshooting steps are much less likely to help fix your BOOTMGR problem. If you've skipped any of the above ideas then you may have overlooked a very likely solution to this problem!
  • Check the hard drive and other drive settings in BIOS and ensure they are correct. The BIOS configuration tells the computer how to use a drive, so incorrect settings can cause problems like BOOTMGR errors.
  • Note: There's usually an Auto setting in BIOS for hard disk and optical drive configurations, which is usually a safe bet if you're not sure what to do.
  • Update your motherboard's BIOS. An outdated BIOS version can sometimes cause the "BOOTMGR is Missing" error.
  • Perform a clean installation of Windows. This type of installation will completely remove Windows from your PC and install it again from scratch. While this will almost certainly resolve any BOOTMGR errors, it's a time-consuming process due to the fact that all of your data must be backed up and then later restored.
  • If you cannot gain access to your files to back them up, please understand that you will lose them all if you continue with a clean installation of new Windows.
  • Replace the hard drive and then install a new copy of Windows. If all else has failed, including the clean installation from the last step, you're most likely facing a hardware issue with your hard drive.


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