I've been running XP on hda and Mandrake on hdb. I added Fedora1 to hdb on seperate partitions from Mandrake. The Fedora installer overwrote the GRUB for Mandrake in the MBR. I need to add Mandrake back to the GRUB configuration but I'm not sure how to do that.

mount the Mandrake partition and see what it says in boot/grub/grub.conf/menu.lst or /etc/lilo.conf if you chose LILO.

what is the proper command string to mount the partition?

execute 'man mount'

The command to mount a partition depends on where the partition is and where you want to mount it. If Mandrake is on /dev/hdb1 and you've made an empty /mandrake folder for it in /mnt/mandrake the command would be
mount /dev/hdb1 /mnt/mandrake
When you're configuring Grub, Grub counts from zero so all numbers are one less than you'd expect. Also it uses numbers not letters for drives (again, one less than you'd expect) so /dev/hdb1 is (hd1,0) to grub. /dev/hda5 would be (hd0,4) and so on. Grub's dead easy to work with when you get the hang of it as you don't need to run grub after you've edited /boot/grub/menu.lst

Allrighty then.... thanks for the help on mounting the partition.

Okay here is the Mandrake lilo.config (I thought I had specified grub but there is no grub.conf?)

[root@localhost /]# cat /mnt/mandrake/etc/lilo.conf
# File generated by DrakX/drakboot
# WARNING: do not forget to run lilo after modifying this file

boot=/dev/hda
map=/boot/map
default="linux-enterprise"
keytable=/boot/us.klt
prompt
nowarn
timeout=100
message=/boot/message
menu-scheme=wb:bw:wb:bw
image=/boot/vmlinuz
label="linux"
root=/dev/hdb2
initrd=/boot/initrd.img
append="devfs=mount acpi=ht resume=/dev/hdb10 splash=silent"
vga=788
read-only
image=/boot/vmlinuz
label="linux-nonfb"
root=/dev/hdb2
initrd=/boot/initrd.img
append="devfs=mount acpi=ht resume=/dev/hdb10"
read-only
image=/boot/vmlinuz-i686-up-4GB
label="linux-i686-up-4GB"
root=/dev/hdb2
initrd=/boot/initrd-i686-up-4GB.img
append="devfs=mount acpi=ht resume=/dev/hdb10 splash=silent"
read-only
image=/boot/vmlinuz-enterprise
label="linux-enterprise"
root=/dev/hdb2
initrd=/boot/initrd-enterprise.img
append="devfs=mount acpi=ht resume=/dev/hdb10 splash=silent"
read-only
image=/boot/vmlinuz-2.6.3-7mdk
label="263-7"
root=/dev/hdb2
initrd=/boot/initrd-2.6.3-7mdk.img
append="devfs=mount acpi=ht resume=/dev/hdb10 splash=silent"
read-only
image=/boot/vmlinuz-2.4.25-2mdk
label="2425-2"
root=/dev/hdb2
initrd=/boot/initrd-2.4.25-2mdk.img
append="devfs=mount acpi=ht resume=/dev/hdb10 splash=silent"
read-only
image=/boot/vmlinuz
label="failsafe"
root=/dev/hdb2
initrd=/boot/initrd.img
append="failsafe acpi=ht resume=/dev/hdb10 devfs=nomount"
read-only
other=/dev/hda1
label="windows"
table=/dev/hda
other=/dev/hdb1
label="windows2"
table=/dev/hdb
map-drive=0x80
to=0x81
map-drive=0x81
to=0x80
other=/dev/fd0
label="floppy"
unsafe



And now the Fedora1 /boot/grub/grub.conf (this is the one that currently boots)

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd1,11)
# kernel /vmlinuz-version ro root=/dev/hdb11
# initrd /initrd-version.img
#boot=/dev/hda
default=0
timeout=10
splashimage=(hd1,11)/grub/splash.xpm.gz
title Fedora Core (2.4.22-1.2115.nptl)
root (hd1,11)
kernel /vmlinuz-2.4.22-1.2115.nptl ro root=LABEL=/ hdc=ide-scsi hdd=ide- scsi rhgb
initrd /initrd-2.4.22-1.2115.nptl.img
title DOS
rootnoverify (hd0,0)
chainloader +1

I've tried to add what I think is the correct lines in grub.config but I keep getting errors. Based on the above lilo.confg file what should I add to grub.confg to get mandrake to boot?

Took me a while but I figured it out.

Thanks