3.Position power supply connector P4 so the large tab on the connector faces the right side of the computer. Beginning with the six pins toward the back of the computer, carefully line up the holes in the connector with the pins in the socket and then push in the connector.
If you do not correctly align the holes with the pins in the socket, you could severely damage your computer
4.Connect power supply connector P5 to the remaining six pins in the socket using the same procedure.