One of the problems i got from the user in my office is, it’s hardy won’t shutdown properly, it always stuck with an error line like this “… need to put acpi=force to make acpi working …”
The error line is very clear there, telling us to add a command line in the menu.lst.
This is how to solve it. edit menu.lst
$sudo vim /boot/grub/menu.lst, put a command acpi=force between the line :
kernel /boot/vmlinuz-2.6.24-16-server root=UUID=cce77746-6057-4a05-9a05-5f186c35add0 ro quiet splash
and then just reboot 
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