Hi,
I managed to run a live linux with boot-repair utility. The utility said it cannot help but generated the following report :
Code
sda: ___________________________________________________________________________
File system: iso9660
Boot sector type: Grub2 (v1.99-2.00)
Boot sector info: Grub2 (v1.99-2.00) is installed in the boot sector of sda and looks at sector 6353368 of the same hard drive for core.img, but core.img can not be found at this location.
full report : https://sprunge.us/XQICO2