mbr corruption?
 

Hi,
My friend has slack 9.1 and it was working fine until one day it refused to boot and after the initial check showed 9A9A...... no lilo and it won't bot through the slack cd again.one more friend installed from the same cd and the same problem occured.yet another of my friend used this cd and his is working fine.any suggestions on how to go about the rescue?

I'd suggest reinstalling lilo back to the MBR.

Boot with a rescue CD
Mount your root filesystem to a temp dir
chroot to that dir
run /sbin/lilo -M /dev/hda (assuming hda is where you boot from)
run /sbin/lilo (to check for any other errors)
say your prayers and reboot :)