changing root on rescue disk

[Joanna Bryson <joannab dai ed ac uk>]

Hello again --

I'm having an apparently standard problem with LILO not dealing with a
large disk well, -- it stops at "LI".  I need to be able to mount one
of my partitions as root, but I can't get it to work right from the
install/rescue disk.  I've tried typing:

linux root=/dev/hda3   [sic -- yup, that's where / should be]
and 
rescue root=/dev/hda3

but I can't seem to convince it to come up correctly.  Apparently
this was a standard operation under RH 3.x  I need to alter my lilo.conf
file (I think) because it's ignoring the fact I have the /boot on a 
different device (/dev/hda2) in a sufficiently low cylinder number
to be run.

After booting off rescue, I can mount /dev/hda2, but interestingly
can't mount /dev/hda3 anyway, so perhaps there's just something wrong
with my partition?  Though fdisk in the install program says its OK.

Thanks in advance,

Joanna