[Maced] data projector

[Anne-Maree]

Apologies if this has been dealt with previously.
Running an Intel MacBook on 10.5.3
Have a NEC Data Projector hooked up but it is not projecting what is  
on my laptop screen.
It's just showing a background display, not even the mouse.
On my last laptop I pushed F7 and it changed the screen but it doesn't  
seem to do the same anymore.
Help please.

Anne-Maree
Port Kembla PS

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