which windows disc did you use to repair it?
Do you have a win 10 installer? If not, on another PC, download the
Windows 10 media creation tool and use it to make a win 10 installer on USB
lets try start up repair
change boot order so USB is first, hdd second
boot from installer
on screen after languages, choose repair this pc, not install.
choose troubleshoot
choose advanced
choose start up repair - this will scan PC and maybe fix this - will ask for logon info
another choice is follow this, it uses same blue menu as the above fix does:
http://www.thewindowsclub.com/repair-master-boot-record-mbr-windows Stop once it starts talking about the repair disc