Hello. I've installed CentOS6.5 x86_64 on DN2820FYKH. I want to shut down with power button. But, the acpid daemon cannot work correctly. And, after I selected grub menu, the error message "ACPI: Unable to load the System Description Tables" is displayed. Does this message relate to the issue? I've checked, but the issue doesn't solve: *BIOS update ==> BIOS ver.0028 to 0038(latest) *BIOS setting *Legacy/UEFI boot *CentOS setting ==> /proc/acpi/ directory does not exist. Please can anyone help me with this issue? Regards, Onobori