08-06-2014, 01:58 PM
There are few ways that the "BOOTMGR is
missing" error may show up on your computer, with
the first error I have listed being the most common:
"BOOTMGR is missing
Press Ctrl Alt Del to restart"
"BOOTMGR is missing
Press any key to restart"
"Couldn't find BOOTMGR"
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 to load when the
BOOTMGR error message appears.
Causes of BOOTMGR Errors
There are a number of possible causes for
BOOTMGR errors, including the most common
"BOOTMGR is missing" error message.
The most common reasons for BOOTMGR errors
include corrupt and misconfigured files, hard drive
and operating system upgrade issues, corrupt hard
drive sectors, an outdated BIOS , and damaged or
loose hard drive interface cables.
Another reason you might see BOOTMGR errors is
if your PC is trying to boot from a hard drive or flash
drive that is not properly configured to be booted
In other words, it's trying to boot from a non-
bootable source. This also would apply to media on
an optical drive or floppy drive that you're trying to
How To Fix BOOTMGR is Missing Errors
1. Restart the PC. The BOOTMGR error could be
2. 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
disc, external drive, or floppy disk.
Note: 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 is listed as the first
3. Check the boot sequence in BIOS and make
sure the correct hard drive 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.
I know I sort of hit on this in the
troubleshooting step above, but I wanted to
call out specifically that you might have the
wrong hard drive listed, as many BIOS/UEFI
systems allow you to specify specific a
particular hard drive to be booted from first.
4. Reseat all internal data and 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.
5. 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. Just continue
troubleshooting - something will work.
6. Write a new partition boot sector to the
Windows system partition
to 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
7. Rebuild the Boot Configuration Data (BCD) .
Similar to the partition boot sector, a
corrupted or incorrectly configured BCD could
cause BOOTMGR error messages.
Important: 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
8. 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, including 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.
9. Update your motherboard's BIOS . An
outdated BIOS version can sometimes cause
the "BOOTMGR is Missing" error.
10. 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
If you can't 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 Windows!
11. 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.
BOOTMGR Errors Apply To
BOOTMGR issues apply to Windows 8 , Windows 7,
and Windows Vista operating systems only.
Windows XP does not utilize BOOTMGR. The
equivalent function in Windows XP is NTLDR which
produces the NTLDR is Missing error when there's
a similar problem.