Then, attach the front-panel audio cable, USB 2.0, USB 3.0 and 3.1/3.2 case connectors to those headers.
OK, just a few more cables to go until we try turning the PC on. Make sure the connectors for any fans are plugged into the motherboard fan headers. Then, attach the front-panel audio cable, USB 2.0, USB 3.0 and 3.1/3.2 case connectors to those headers.