dual display

[billyo]

i tried to set up the dual display of my friends laptop which she bought from mtu, laptop came with the rf modulator..tried everything, dual display just wont work..with or without the modulator..( does she really need the rf modulator ? ) the reason i asked was if the laptop is capable of dual display why does she has to used the modulator..but anyway everytime i do the steps to set up the dual display and point the cursor on the second screen..it keep saying "not active" i'm pretty sure i didnt make any mistakes caused i set up both of my laptops..and i think she bought the laptop 2 or 3 months ago..