JUst hook your old monitor and boot from hd.
Edit /etc/lilo.conf and append the cheatcode, ex: fb1280x1024

image=/boot/vmlinuz
label="Linux"
root=/dev/hdc5
initrd=/boot/initrd.img
append="devfs=mount hdd=ide-scsi splash=silent acpi=ht fb1280x1044"
read-only
**This is not a real lilo.conf, I just made it up. The important part is "append="
line where you add cheatcodes.

After editing and save the lilo.conf , you need to update lilo.
Open root konsole and run this command: lilo