Connectors When working with the power supply, you need to know about some of the connectors. Most importantly if you are using a new case, you might have to connect the supply to the power switch on the front of the case. Some people have a hard time doing this, since there are four wires, and four tabs, and finding which wires goes to what tab can be difficult. So here I show you. You will usually have four color-coded wires.
Some cases provide a fifth that is simply attached to the case for grounding.
They bring the full 110V to the switch. The black and white wires carry the AC current from the switch to the power supply. These wires are only hot when the system is on, because the switch actually closes the circuit. If you have a green wire, sometimes with a stripe, it is a ground wire, and is attached to the case somewhere. When connecting, place the blue and brown wires on the tabs that are parallel and next to each other.