Cause for this Bootmgr image is corrupt. The system can not boot issue can be following
The basic input/output system (BIOS) does not detect the hard disk.
The hard disk is damaged.
Sector 0 of the physical hard disk drive has an incorrect master boot record (MBR).
Note Some third-party programs or disk corruption can damage an MBR.
An incompatible partition is marked as Active.
Partition that contains the MBR is no longer active.
Troubleshoot steps.
Boot into repair mode: repair your computer->troubleshoot->command prompt
Run a chkdsk for your main partition (e.g. C:), to do that enter:
chkdsk c: /f/r
Bootrec.exe: Repair MBR
/fixmbr
This will create a new Master Boot Record, but will not overwrite your exisiting partition table.
/fixboot
This will add a new boot sector. If you boot sector is damaged you might not be able to start your system.
/rebuildbcd
Scans your disk for Windows server 2012 compatible installations, needed to repair your Windows installation.
If you changed the “mark partition as active” option to other partition by mistake, then the error occurred, please try to use the cmd diskpart:
diskpart
list disk
select disk 1
list partition
select partition 1
active
Regards.