OK, this thread is 5 months old, but I would like to add a few comments that might help subsequent readers.

The underlying question is about how to wire up a MoBo and PSU.

Over the past few years all the cases that I have bought have had the front panel USB and audio connections as a single block. There is a pin missing from the MoBo and a blank space on the case connector.............it will only fit one way.

The other cables have a white wire and a varied coloured one. The white or common colour is negative or neutral and the coloured one is live or positive.