Few problems with first build

Krakin

Honorable
Dec 21, 2012
17
0
10,510
Hey there guys, so recently I decided to build a PC for the first time, here is a list of all the parts; https://www.pccasegear.com/index.php?main_page=wish_lists&wlcId=120210&action=wish_lists
So today they arrived and I have been putting them together but I'm kinda stuck, i have the motherboard installed into the case, cpu and heatsink are both on the motherboard and im working on connecting the cables in the case to the motherboard. There are two cables in particular though that I have no idea where to connect; first is a 1394 cable, it fits into USB ports but i read that that wasn't a good idea, it also fits into one that says 'COM1'. Second is I think for the fan, it has four prods on one side and 4 holes on the other, do i connect that directly to the power supply?
 

Krakin

Honorable
Dec 21, 2012
17
0
10,510
Yeah the fans have 3 pin headers and the motherboard has 4pin slots but the fans still fit in them. Also, does it matter that one face of that double molex thing for the fan is unused?