2 dual video cards one computer

Question for a techie? I have a dell inspiron 531 with vist home premium on it. I had 2 dual video cards so I can have 4 screens attached. It was fine for the past year. Yesterday I had a video card blow out a nvida e groforce 7300t(pci-express slot). So now I am left with on it is a nvida gf fx5200 (pci slot) and I bought a new card yesterday it is a nvidia geforce 9400t. So when I put that in my computer only recognizes that one, and when I try to get drivers for the other one the 5200 in there it says not compatible vga display or something. And when I look at device manager for displays the one thats not workin says code 43 Windows has stopped this device because it has reported problems. (Code 43) Before my bad card blew this one worked as well. So now I can get this 5200 to work or the 9400 to work but not both like I had before. So when I go into displays it just shows 2 monitors instead of the usual 4. Can anyone shed some light on this? thanks
 
Thanks for the responses, I just might have to get another card that was the same, I figured I would get the new model but that didnt work, and I even found and had the computer load up to date drivers, and it said that was good to go but didnt work. I really dont want to take it to a repair shop becuase they ssaid it could take a week or more, but I will if I have too. I will keep pluggin away until I either throw my computer against the wall or jsut raise the white flag! I also had a radeon 2400 pro lying around but that didnt work either.
 
so would i have to get the same exact video card? becuase when i had the 5200 and the nvidia 7300 they both worked. i need to find exact video cards but one pci and one pci-e to fit the slots then?
 
Quote from rsikit:

so would i have to get the same exact video card? becuase when i had the 5200 and the nvidia 7300 they both worked. i need to find exact video cards but one pci and one pci-e to fit the slots then?

Easiest would be to just get another 7300t. Or, you could start over and look for another pair of compatible cards that will work with your mobo.
 
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