specifies whether the system can be switched off with the On/Off switch on the front of the unit when the ACPI function is not active. Enabled The system can be switched off with the On/Off switch on the front of the unit. Disabled The system cannot be switched off with the On/Off switch on the front of the unit. If the On/Off switch on the front of the unit is pressed for longer than 4 seconds, the system always switches off. Power On Source