If you have a system that has and ide device and scsi device installed and you have the bios set to boot to the scsi device first before the ide device, it will fail. This due to the fact that the installer only gives two options in the lilo configuration screen. /dev/hda (Master boot record of ide device) or /dev/sda1 (first sector of scsi partition 1) You would need a boot disk in order to boot using the second choice since it will never look in the master boot record of the scsi device. The choices may need to be /dev/hda /dev/sda /dev/hda1 /dev/sda1 which would give a little more control over how the system boots. The previous configuration does although work if you choose /dev/hda and set your BIOS to boot to ide first instead of scsi.
We have no way of knowing what the system BIOS supports, or how it's set up. Getting this right is more then changing a screen.
I accept that. But maybe giving the choice with proper explanation would be nice for a future version of the installer.