I would like to add an internal card reader. The plug for the reader is an nine pin, two rows of five pins with the last closed. 
 
 
 On the MB I have seen the readers on pictures of the 5100, and tried to find that connector but it seems non- standard because, as you see in the next picture, it has the 7 pin closed and not the 10.

The mobo installed on my Dimension 5100  is Connolly e187242.

I can't install that card reader, what should I do, return it to seller? Or is there another solution?