I successfully installed slackware 9.0, upon trying to boot up it stops (before lilo) and says L 99 99 99 99 99 99 99 (goes on for like 20 mins) and doesnt load up slackware, is there any way to fix it other than reinstall?

(I think it's being cuased by lilo..)

most likly something changed since lilo was setup (during installation)

so to change we need to boot off your root partition using another kernel on another disk (since lilo is hosed)
and then to recall lilo

so grab CD1 of your slackware install disks, stick it in and reboot the computer (boot from the cd)

when prompted push the button for help (you want to type some commands to lilo, the lilo on the disk)

when you know how to do this (it will be in the help on the disk you just booted from)

you will want to type

linux root=/dev/hda1
or where ever your root partition is (/dev/hda1 is the first partition on the first IDE harddrive, /dev/hdb1 is the first partition on the second IDE drive)

it may complain about linux not being found, if so try

rescue root=/dev/hda1

or

expert root=/dev/hda1

then the computer will boot normaly and you will be given aprompt (most likely)
Once you are at the prompt, log in as root
and type
lilo

lilo will do its thing.
now type reboot
and try again

the config file for lilo is /etc/lilo.conf

don't forget
man lilo
and
man lilo.conf

Thank you.