Everything seems fine while building my PC but when I turn it on, all the lights are working all the fans are working but my mouse and keyboard don't light up and my screen doesn't turn on, I think it's b cause I have a 6-pin and a 4-pin, 6-pin is for gpu and 4 pin is for the motherboard, the motherboard takes a 8pin so do I need to buy a 4-pin to 8-pin or is there something else completely wrong