had this issue on my Inspiron 8200. this is a solution someone else offered up
Quote:
Originally posted by digitalboi
type: su
then type: password
then type: vi /etc/lilo.conf (can use any editor you like such as pico,etc)
then in each image section there is a append line, you need to add "acpi= ht nolapic"
after u add those lines
type: lilo (rebuilds ur lilo.conf)
type: reboot
u should be able to unplug the laptop (w/o freezing) and when u send the halt signal it will actually turn all the way off 
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this should also fix the problem of your computer crashing when you plugin/unplug the AC adaptor (if you were having that problem)
if you use grub instead of lilo, do the same thing, but edit the file /boot/grub/menu.lst
hope that helps.
