Usually, the issue appears shortly after the computer is turned on, immediately after the Power On Self Test (POST for short) is complete. However, sometimes BOOTMGR is missing or lost due to some reasons including incorrect bootable disk, damaged MBR, outdated BIOS, loose or damaged hard disk interface cables, etc. BOOTMGR can read boot configuration data and display the operating system selection menu. If there is no system reserved partition, BOOTMGR probably locates on your primary partition C. On most PCs, the partition is labeled as system reserved without a drive letter. Usually, the BOOTMGR file is read-only and locates in the boot directory of the partition which is set as “active”.

Press Ctrl+Alt+Del to restart “ when booting your Windows 10/8/7? This post walks you through 11 useful solutions to help you get rid of this issue.īOOTMGR, short for Windows Boot Manager, refers to a small piece of software that is loaded from the volume boot code. Get a black screen saying “BOOTMGR is Missing. 11 Helpful Solutions to “BOOTMGR Is Missing” Error

Bootmgr is missing windows 10