I've hooked this up Many times before, I used it all through college with this same laptop. I have an Inspiron 6000, not the best but it works fine. Anyway, when I plug in my second monitor, it will turn on and act as though it is the main monitor. But then it won't allow me to use it as an extension of my desktop, which is what I want to do, but I tryed for about an hour and it just won't identify my second monitor as a second monitor, it keeps identifying it as the first along with my main monitor. ANY HELP? Thanks Tony!