I want to use a big screen tv as a second monitor. I bought a video card (Zotac GeForce 9400GT DP) from Microcenter. I told the salesman what I wanted to do and he recomended this card. Now other people tell me I can't use this for the application. Can anyone tell me how to get this to work with what I have. The tv is a new Vizio flat screen and the computer is a new Gateway. Thanks!