If there are any non-bootable external media connected with your copmputer, your computer probably boot from these non-bootable devices.
Solution 2: Set your hard disk as the first boot device Solution 1: Remove all your connected media You may not have to try them all please work from Solution 1 until you find the one that work. We gives you different solutions for you to try. This problem can be caused by different reasons. It is fully responsible and essential for starting your computer’s operating system. You can work out this problem with this following tutorial: What is BOOTMGR?īOOTMGR(Windows Boot Manager), a very small software in your boot volume, can read your boot configuration data and display the Windows system selection menu. So you restart your computer unfortunately the error pops up again.ĭon’t be nervous. However, just now when you turn it on as usual, you don’t see the Windows logo you see a black screen instead, and it’s telling you BOOTMGR is missing.
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