if you want audio as well you will either need a separate cable or you will have to spend a little extra money on an adapter to get something like
this.
95% of all DVI connections do not have audio strings, there are some, so try it with a plain adapter (chances are you can probably find one from a friend to borrow, I know that I have 3 floating around somewhere that I just don't use) then if you have audio you are golden, if not then you can investigate other options, like the one that I have linked.