Every graphics card dies on my rig.?

Basically every graphics card i put into this rig dies. My first card (x1950) worked for a year before dying. Basically the fan on the card runs, it's just that it is not detected. So I used my product service plan from where I bought it, so I was able to switch it for a 3870. It worked great for 2 days and then it died; with the same results as above. Frustrated, I exchanged it for the same card, and also picked up an OCZ PSU as well as a new NZXT Apollo case (fearing it may have either been the PSU or overheating). Again, the new card dies in 2 days. What could it be :S
Every graphics card dies on my rig.?
Hmm, let me think.. buy a new damn computer?
Every graphics card dies on my rig.?
faulty motherboard. !!!
Reply:My first thought would be your Power Supply, but since you replaced it this is most likely not your problem. What kind of mainboard do you have? Perhaps something is wrong with your PCI-E slot.
Reply:My guess was also the power supply at first but after what you said I think you should replace your motherboard try testing your video card in a friend's motherboard and see if it works.

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