If the hard drive cables or wires from the power supply are not connected tightly, then when moving the system unit, the contacts could come undone. Unfortunately, it is not always possible to fix the 'bootmgr missing' issue in Windows this way, so there are a few other great ways. You should see the result of the recovery and a message similar to “Fix and restart.” Click on it and wait for the automatic reboot of the system.

Then simply wait and watch what happens on the computer. Now click on the “Next” button, then “Restore Startup”. After the first window of the boot program appears on the screen of your computer, you will be able to choose options for action choose System Restore.

When the computer just turns on and passes the tests, you can see text similar to “F8 - Select Boot menu” (on different computers, this key may be different, so be careful). In order for the flash drive to appear in the list, you must first insert it into the USB port. Remember: in the BIOS, you need to set the desired device as the boot disk.

This method requires a boot disk or flash drive.

Repair bootmgr windows 7