GRUB_CMDLINE_LINUX_DEFAULT="quiet splash reboot=bios" 
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash apm=power_off"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash reboot=pci"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=off"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force apm=power_off"