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For example, if the Windows OS is installed on the first hard disk, Windows will say BOOTMGR is missing when it has set boot PC from the second hard disk. Incorrect BIOS order will prevent normal boot to your computer if there are two or more disks (internal disk or removable disk) on your computer. If PC still cannot boot after restarting PC for several times, you should check if the boot order is wrong in BIOS settings. 2nd step – Change Boot Order in BIOS Settings USB flash drive, memory card, and external hard drive) before rebooting the computer to prevent Windows from booting from removable disk. Forced shutdown probably cause further disaster to your computer. Please do not press the power switch to turn off the computer directly unless you cannot successfully switch off the PC by pressing Ctrl + Alt + Delete keys. When seeing the warning message, you can press Ctrl + Alt + Delete keys on the keyboard to restart the computer. Since this is a problem resulting from many reasons, you can follow the steps below repair the issue: 1st step – Remove all removable disk and restart computer

When seeing such kind of error message, your computer cannot boot and enter Windows system normally. BOOTMGR Is Missing Press Ctrl + Alt + A to restart Usually, the error message shows on a black screen before entering Windows operating system.ġ.