Now this is probably a very stupid question, but I'm very new to upgrading a computer and this is my first time. I have a new NVIDIA GTX 275 to replace my old ATI RADEON 5570. The problem is I can't get it out of the case...I unscrewed one that was on the outside, near the HDMI port, is that it? Are there any other screws that I need to remove? The graphics card won't budge, but since this is an HP computer that's being upgraded for the first time, a bunch of the parts would probably be really stiff. Is that the only screw I need to remove? I don't want to risk pulling too hard and damaging the card somehow.