What is the video driver that you are using on your laptop?
A number of cases have popped up recently where the video driver installation did not install necessary components for an extender.
Here is a link to a thread with instructions to do further diagnosis:
http://thegreenbutton.com/forums/thread/274587.aspx
1: Dimension 9200 - Vista Ult, 2.4GHz Q6600 Core2Quad, 4GB RAM, 160GB, 750GB, 500GB USB, Nvidia 8300GS, PVR-150, HDTV Wonder, Vbox 3560, X360, DMA2100
2: HP m376n - MCE 2005, 2.6 P4 w/HT, 1GB RAM, 250GB, 400GB USB HD, Nvidia 6200, Emuzed MAUI, X360