Connect an Ethernet cable
To access the Internet or a network, connect one end of an Ethernet cable to either of
the Ethernet ports on the back of your Mac Pro. Connect the other end to a DSL
modem, cable modem, or Ethernet network.
Connect the keyboard and mouse
Connect the keyboard cable to one of the USB (d) ports on the computer or on your
display. Plug the Mighty Mouse cable into a USB port on the keyboard.
Gigabit Ethernet ports