Well, like I said, I'm a newbie at this, I had to swap out the video card, it was toast, . I'm guessing it was an AGP, 'cause the slot is further in and its a brown slot, while the rest are white and closer to the back of the machine. The old video card is a nvidia gforce 2mx. Its the dell dimension 4100. Im not sure where to find info on the motherboard chipset.