Does anyone know what this solder connection is for?

It'll either be ground or 12V pins that are soldered together I would think given you only get them on the 4pin connector, probably a 12V though. Why? No idea, maybe his PSU was missing a pin or something in one of the connectors.
 
There's pins in all the sockets, the previous person was using a PSU that I can only describe as a strip with a 20pin port on it. Something out of a laptop or a mini-itx maybe?
 
My ITX case has an external power brick that supplies what I assume is 12V DC to a an internal circuit board where the ATX, molex and SATA power connectors all plug into.
 
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