How to fix 'bootmgr is missing' in windows

Tyên ổn Fisher has 30+ years' professional giải pháp công nghệ support experience. He writes troubleshooting content & is the General Manager of au-79.net.

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The "BOOTMGR is missing" error displays shortly after the computer is turned on, immediately after the Power nguồn On Self Test (POST) is complete. Windows has only initially started to lớn load when the BOOTMGR error message appears.


How to lớn Fix 'BOOTMGR Is Missing' Errors

Restart the computer. The BOOTMGR error could be a fluke.


Chechồng your optical drives, USB ports, and floppy drives for truyền thông media. Often times, the "BOOTMGR is Missing" error will appear if your PC is trying khổng lồ boot to a non-bootable disc, external drive, or floppy disk.


If you find that this is the cause of your issue & it's happening regularly, you might want to consider changing the boot order in BIOS so the hard drive sầu is listed as the first boot device.


Chechồng the boot sequence in BIOS and make sure the correct hard drive sầu or other bootable device is listed first, assuming you have more than one drive. If the wrong drive is listed first, you could see BOOTMGR errors.

We sort of hit on this in the troubleshooting step above, but it's important lớn call out specifically that you might have sầu the wrong hard drive listed since many BIOS/UEFI systems allow you lớn specify a particular hard drive lớn be booted from first.


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

Try replacing the PATA or SATA cable if you suspect it might be faulty.


Persize a Startup Repair of Windows. This type of installation should replace any missing or corrupt files, including BOOTMGR.

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Even though a Startup Repair is a comtháng solution for BOOTMGR problems, don't worry if it doesn't fix your problem. Just continue troubleshooting—something will work.


Write a new partition boot sector lớn the Windows system partition to lớn correct any possible corruption, configuration problem, or 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 khổng lồ the partition boot sector, a corrupted or incorrectly configured BCD could cause BOOTMGR error messages.


The following troubleshooting steps are much less likely lớn help fix your BOOTMGR problem. If you've skipped any of the above ideas then you may have overlooked a very likely solution to lớn this problem!


Cheông chồng the hard drive sầu và other drive settings in BIOS and ensure they are correct. The BIOS configuration tells the computer how lớn use a drive, so incorrect settings can cause problems like BOOTMGR errors.


There's usually an Auto setting in BIOS for hard disk & optical drive sầu configurations, which is usually a safe bet if you're not sure what lớn 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 và install it again from scratch. While this will almost certainly resolve any BOOTMGR errors, it's a time-consuming process due to lớn the fact that all of your data must be backed up & then later restored.

If you can't gain access to lớn your files khổng lồ baông chồng them up, please understvà that you will đại bại them all if you continue with a clean installation of Windows!


Replace the hard drive sầu 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 sầu.

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Need More Help?

If not you're not interested in fixing this BOOTMGR problem yourself, see How Do I Get My Computer Fixed? for a full list of your tư vấn options, plus help with everything along the way lượt thích figuring out repair costs, getting your files off, choosing a repair service, & a whole lot more.


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