In my particular case, on my PII 266, i chose 'noapic nolapic' as a boot parameter, with the net-installer-rc2, installed the package 'apmd' and rebooted, then as root: 'shutdown -h now'.
GRUB: if you're using it, add:
in /boot/grub/menu.lst, in the line that starts with:
withouth descommenting it.
LILO: do the same to the file /etc/lilo.conf
in the line that starts with
uncomment it, and make sure 'noapic nolapic' is within the quotation marks already there, so i looks like this:
append= "noapic nolapic"
don't forget to install 'apmd' and reboot, an then:
#shutdown -h now
I don't know if it will work for you, but it does for me.