If /boot is indeed on it's own partition do NOT do anything
Remove the (separate) root partition if you like, nothing affected.
- if /boot is simply a mount point, and actually exists on the same partition (under) the root, you have significant problems. Copying the conf will achieve nothing.
You will need to create a new partition, reboot the RH install CD into recovery mode, re-install grub, (in need) copy the conf across and update it, update the fstab to mount the new partition as /boot.
The reason all this is required is because the loader uses (relative) sector counts to find the stage files (and conf). You go moving things around (or deleting them), you wind up with the grub prompt.
Otherwise, tuxrules post seems to cover things.