NEC VT460 Multimedia Projector "press fn f4 nothing happens" Questions

...On an HP, you press FN+F4 once, to turn off the LCD, and use the projector. Press it again to run both at the same time, and press a third time to use just the LCD. The cycle repeats on each

...that Fn + F8 is the right combination. Could be Fn + F4, depending on your laptop. If the key combination is OK, your VGA cable (from the projector to the laptop) could be faulty. Hope this

...fn" and then press the appropriate "F" key, the laptop will switch to "laptop/external display". Another set of key presses will get "external display only" mode. And, finally, the next sequence will ...