NOTICE THE 'acpi=force' appended onto the kernel line ? Do that and Save the file...
CTRL+o, then Enter, then CTRL+X

## ## End Default Options ##

title           Debian GNU/Linux, kernel 2.6.16-2-686
root            (hd1,0)
kernel          /boot/vmlinuz-2.6.16-2-686 root=/dev/hdc1 ro acpi=force
initrd          /boot/initrd.img-2.6.16-2-686
savedefault
boot