you need to enable acpi & acpid support:
first edit (i forget the exact path) /etc/acpi/event.d/default
and edit the power line so that instead of '/sbin/init 0' you can put another command like 'echo 'i am doing nothing''
now edit /etc/lilo.conf and add a line in your image section:
update lilo, reboot, and start acpid.