Quote: Originally Posted by pimpmode
The black plug is the one im talking about....what is that?
That's a male (or is it female?) connector that the non-AC end of a wall wart (read: DC power supply that you plug into a wall; looks like a black "wart," hence the name.) Trust me, you've seen hundreds, if not thousands, of those things - most likely use one to charge your cell phone, power a USB hub, etc. in your house.
The PSU you're looking at *expects* regulated 12v in, hence the use of that connector (and many many posts on this board about it).