Re: AGP slot not recognized
If the description was said to be untested, then it could be fried, but in some cases, I ended up a BIOS flash to get my PCI-E slot to work. Don't ask why, it just happened.
So, I'd say to try another video card that your friends or family could have, and if you ever try it and it works, then good, but if it doesn't, then consider looking for a BIOS flash.
If you can't get your hands on one, try taking your GPU to another person's PC and test it. Another thing you could do is to run to your local shop and have them test it.