How to fix 'bootmgr is missing' in windows

Tim Fisher has 30+ years' professional technology tư vấn experience. He writes troubleshooting nội dung và is the General Manager of sydneyowenson.com.

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


How lớn Fix 'BOOTMGR Is Missing' Errors

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


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 lớn boot to a non-bootable disc, external drive, or floppy disk.


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 so the hard drive sầu is listed as the first boot device.


Cheông xã the boot sequence in BIOS & 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 sầu is listed first, you could see BOOTMGR errors.

We sort of hit on this in the troubleshooting step above sầu, but it's important to Gọi out specifically that you might have the wrong hard drive sầu listed since many BIOS/UEFI systems allow you khổng lồ specify a particular hard drive sầu to 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 common 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 to lớn the Windows system partition 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 to lớn the partition boot sector, a corrupted or incorrectly configured BCD could cause BOOTMGR error messages.


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


Check the hard drive sầu & other drive settings in BIOS and ensure they are correct. The BIOS configuration tells the computer how khổng lồ use a drive sầu, so incorrect settings can cause problems lượt thích BOOTMGR errors.


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 lớn do.


Update your motherboard's BIOS. An outdated BIOS version can sometimes cause the "BOOTMGR is Missing" error.


Persize a clean installation of Windows. This type of installation will completely remove sầu Windows from your PC & install it again from scratch. While this will almost certainly resolve sầu any BOOTMGR errors, it's a time-consuming process due to lớn the fact that all of your data must be backed up và then later restored.

If you can't gain access to your files to baông xã 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 & 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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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 menu of your support options, plus help with everything along the way lượt thích figuring out repair costs, getting your files off, choosing a repair service, and a whole lot more.


Chuyên mục: Công Nghệ