I've been using a Geforce 6200 oc PCI for my video card. However, my uncle recently gave me a Geforce 6600gt agp video card. I tried to install it and then realized that it has some sort of power cable that you need to plug in for it to work. I cannot find any plug in that wil fit the power cable. I'm using a Dell Dimension 8250 with an Intel 850e motherboard. Any help is appreciated.