Dual monitor problem

[hchackenbush]

i just set up my projection screen and can only get wallpaper on it. i an move icons over there but what i would like to do is use it as my primary monitor. i've been to "display" and tried everything. i even tried to disable the laptops scree. it would not take it. i had this same laptop hooked up to a 19" crt and prior to that i had it working on my infocus x1 projector with great results. any suggestions??? thanks hackenbush