problem with shutting down pc in slackware

[sardonyx]

my problem is that when issue this command..

shutdown -h now

it will read and the last message is "Power Down" and i need to push the power button on my pc..

what i want to do is that when i issue this command..

shutdown -h now

it will automatically shutdown my pc like in windows..

i try to edit this file..Lilo.conf and add this line..

append="acpi=power-off"

and i also uncomment this

/sbin/modprobe apm

on rc.modules

and run this..

lilo -v

but when i issue the command..

shutdown -h now

it gives the error message..

general protection fault

what should i do to solve this??
any help will be much appreciated..
thank you in advance..

[Libervisco]

Maybe ACPI support isn't turned on in your kernel. When installing slackware you have an ability to choose an acpi enabled kernel to install which already has that option compiled.

If you don't have that, then it could explain why it can't automatically be powered off.