New
#11
I thought you tried repairing with a Win 10 install media and it didn't work.
I suggested trying to do a startup repair with a Win 7 install media.
I fixed an unbootable PC where the bootloader is in the Win 8.1 partition/OS.
The startup repair didn't work with a bootable 8.1 disc, but i did fix the problem using a Win 7 disc.