I had to reload my dual boot Desktop computer with Windows which
did away with my grub. I had heard about a tool that could be
downloaded as an ISO bootable disk, called "Grub Repair Disk",
I think. I searched for it and found the web site and made a
disk. I booted up with it and did a grub repair which reads the
disk and recreated grub just like new. It is something I now have
in my computer repair kits.