... and this machine doesn't have a floppy drive, so I don't have a boot disk.

How canI get grub back?

I tried booting with the RH CD to upgrade the boot loader, but:
1. It no longer has a current configuration to upgrade and
2. If I try to create a new bootloader config, it says that I didn't install any kernel packages, so it couldn't use the new bootloader.

I tried running "linux rescue" off of the RH CD (at boot time). I can get to a shell, but I can't run grub-install because of the way linux rescue mounts the system drive.

am I stuck?

Yes, I had the same problem. Just upgrade redhat, and when it asks you what packages you want to install, select the kernal you want to use. Then you will be able to make a new GRUB configuration.
Hope this helps ,
Thad Blankenship

Well, that didn't work, so I must have done something wrong.

When I boot from the RH CD, choose "upgrade" then choose to select the packages to upgrade, but when the package list comes up, the kernel is not listed. kernel-smp, kernel-source, kernel-utils, kernel-boot, & kernel-pcmcia are there, but none of them seem to do the trick.

Any other ideas? I'm running RH 7.3

Thanks

When you boot the RH CD it will mount the root partition to /mnt/sysimage
then:
chroot /mnt/sysimage
Now try reinstalling grub
grub-install

tried that (as it says in my original post). grub-install is a script that looks for various other scripts that aren't where they are supposed to be because the original file system now starts at /mnt/sysimage as opposed to /.

Did you you use the chroot command?
The chroot command will chang / to be /mnt/sysimage.
See:
http://www.mcsr.olemiss.edu/cgi-bin/man-cgi?chroot+1

awesome! back up!

you rule.

thanks.

I had that problem a while back when I reinstalled ME, I have my C(hda) with 2 partitions, and my D(hdb) has Redhat9, grub was installed on the C drive( where windoze is) in place where the mbr would be.
after grub was trashed by Windoze I could still get to my Redhat with its boot floppy.
Once in Linux I opened a terminal as SU and type "/sbin/grub-install /dev/hda".
It worked for me. found my answers here in the forum.