Problems with recognizing projector.

Hi all, I'm a spanish teacher at my local highschool and I have a projector that is availible to the students to use for powerpoint presentations and the such, but recently I upgraded from my older mac laptop, to a new mac-pro powerbook. the projector no longer recognizes the computer and vice versa, anyone have any similar experiences/fixes/help that they could offer me?
if so that would be wonderful.
thanks in advance,
Terri Salsman de Rodriegex

there is definitely a problem connecting to projectors. I have a 50% success rate when going into meetings with a foreign projector. Compared to my Powerbook which was much higher (100%). Not sure what the issue is... and yes, i've tried F7 (mirror) and changing the resolution, and other "sys pref" settings. even tried rebooting (if this had worked i would still say that it's broken, shouldn't have to reboot my machine to connect to a projector).
at this point it doesn't work most of the time, not sure where the prob is (video card, adapter, etc.) but there is def a problem.
MacBook Pro 2ghz, 2gb RAM Mac OS X (10.4.7)

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