I find that with the instruction from a web page I can replace the grub loader on any hard drive on my computer from grub on the CD-rom. What I did was boot on the cd-rom and all you get is a grub system. From the information I gathered I did these things and they worked.
grub> root (hd4)
Here I got some info about (hd4)
grub> setup (hd1)
Here I see a lot of information about the setting up of the second hard drive (hd1) with a grub loader. So it did work fine.
Karl