ok so im not good with computers at all. and i just got a new video card its the evga gtx 550 ti. and i have everything plugged in BESIDES the 6 pin that has to be plugged in. now i dont have ANYTHING to plug into that besides an adapter that they gave with it. the adapter has two big white plug ins and one black one. i have no idea where the two white ones plug into, please help me. please give a detailed response to