I am in the process of building my HTPC. I have a LC-16 case with an Asus P5Q SE mobo.
I am down to the last cable. It comes from the front of the case and is labelled 1394. It also has more wires coming out from the plug on the end but I assume these are spare and are used if your motherboard doesn't have the correct shaped plug.
The only socket I can see on my mobo that would fit the plug is labelled COM 1 which the mobo manual says is the serial port connector.
Unfortunately the manual that came with the case is next to useless.
Here is a link to a diagram of the pins and what they do. The plug I am referring to is listed at the bottom.
Any help would be appreciated.