Sounds like the 40" is set as a extended desk top. If you move the mouse off the edge (usually default is right edge) you should get the cursor on the 40".
If you want the 40" as your primary display. right click desktop- properties-settings tab- Advamced button-
Should have a tab or somethign with a display manager.
Should see a list of the different screen types ie: LCD, S-video, D-sub/VGA, DVI
click on the button that says D-sub or VGA and look for a check box that says make primary display and check it.
That should make the icons show up on the 40" and that be your main display and the laptop screen icons disapear.
at this time i would disable the laptops screen so that you dont run into problems with video playback and games, ect
hope that helps