Not easy lets have a go
have a look at my rough tutorial.
2) lets make up a maxtor /boot/grub/menu.lst file and without yet saving it (overwrite) you post whats different?
title maxtor hda
kernel /boot/vmlinuz root=/dev/hda6 ro (etc)
map (hd0) (hd1)
map (hd1) (hd0)
3) if you have nothing on hdg grub no help. Trick it similar to my post on installing w98 to a second drive (bios deselect drives 1 and 2) etc as per
b4 playing with your bios make sure you know how to make changes etc. Actually you can't do too much damage with the bios technique to install windows to your third drive as long as you know how to reset your drives 1 and 2 back into bios boot up (for the Grub on hda to work)
4) Notice the grub file will be on hda that if we agree is the one you alter. If you do install linux to the third drive any /boot folder there is more like a chainload for linux ok?