When I try to boot a PC my friend recently gave me, the BIOS beeps go on forever, and the monitor gives no response at all. This lead me to believe the video card was messed up. So I opened up the tower, and couldn't even find a video card. There IS a place to plug in the monitor on the tower, and there is a big empty slot in the tower with two plastic clips on the side; is this where a video card is supposed to go?