What motherboard do you have? Do you have the motherboard book? If so It should show a diagram of your mobo with all the ports labeled. Also, have you looked at your motherboard? Take the side of the computer off, take a flashlight and look inside. Do you see a slot(not pci), that looks a little bigger and than pci and is right next to pci? That is where it would be found. I beleive it is a little longer than the pci port. It should be a different color too. Like brown for example. Ok hope that helps