I having browsing the forum for a solution..
Every time i want to poweroff power is stil on and i have to manualy power off
in my grub.lst i have added acpi=off because my computer hangs with out this line
when it hangs it do so at startup
Try the following in your grub boot line in /boot/grub/menu.lst:
Try adding acpi=force to the following line in your grub.lst:
kernel /boot/vmlinuz26 root=/dev/discs/disc0/part4 ro acpi=force
Although it may not work for you because your system seems to have problems with acpi. Anyway, if the above solutions don't work, you can always try this one. It did the trick for me.
My (old) desktop PC needs "apm=poweroff" and my laptop needs "nolapic".
tnx alot apm = power-off did the trick