Went to the store and got a pack of cables that had a 4 pin connector. Get home and absolutely NONE of my cables will plug into it, so I can't plug it into my PSU.

Just in case anybody ever wonders why I'm always so irritated. It's bullshit like this. All I wanted to do was build a new computer and I'm on the 4th day and not any closer, but almost 2400 out of pocket.