PCIe HD DVR Card problem! Please help

Hey everyone. I don't know if any of you are familiar with this product but if you are great.

http://www.newegg.com/Product/Product.aspx?Item=N82E16815100049

so i recently bought the AverMedia HD DVR, the one that plugs into the PCIe slot in the back of my computer. Well i installed it correctly, it says my computer recognizes it the device in the PCIe. I install the software for AverMediaCenter, plug the hdmi port going from my xbox into the hdmi port in the PCIe card, open up AverMediaCenter and get just a black screen in the preview screen? any suggestions?

Any help or input is very appreciated! Thank you.