When connecting front case USB ports directly to the motherboard, use the diagram below to identify the correct pins for each cable.

V is the voltage rail carrying +5VDC, and sometimes goes by VCC or +5. The wire that connects to it should be red.

- and + are the data transmission pins, and sometimes goes by D- and D+.

G is the ground pin. The 'shield' pin (to the right of the top ground) is not used. The wires that connect to the ground and shield pins should be black.