Asus D800SDR User Manual page 27

Connecting a USB keyboard and a USB mouse
Connect a USB keyboard and a USB mouse to the USB ports on the rear panel of your computer.
Connecting the power cord
Connect one end of the power cord to the power connector on the rear panel of your computer
and the other end to a power source.
For safety purpose, ONLY connect the power cord to a grounded electrical outlet.
ASUS Desktop PC 27