AMD graphics card does not work in the Lenovo ThinkStation S10?

OK, so I have and AMD graphics card. (i don't know the name, but i know that I've encountered the same problem before with other AMD cards.) I have a Lenovo ThinkStation S10 that I would like to put it in. When I put it in it simply doesn't work, nothing shows up on my monitor. This is weird, since with my other graphics card, which is an Nvidia, everything was fine. So I thought that it was just the graphics card. Later, I tried it with my brother's graphics card, which is an AMD as well, and I got the same problem. Now, there are two PCI slots in the PC, so maybe I can try the second one and it will be better? Is there some type of solution to this problem?

Well, other than the fact that you are apparently trying to run an AMD/ATI card on Nvidia Drivers (which ain't gonna work)…

I can't think of a reason that it shouldn't work… As long as you have plugged it in correctly and connected any supplemental connectors and have enough power available on the +12 volt rail for it anyway…