Trouble Presenting on a Mac

We have a fairly new Mac and am trying to present from the computer to the projector. We have been using power point and when we present, what we see on the computer screen is the slide being shown on the projector as well as all the slides before and after so that we can go to any slide at any time.
at this point, i can't even get Proclaim to show on the projector screen. why? it is running on the computer when i hit "on air" and that seems to be working. both the basic screen and then an additional screen of what should be projecting on the overhead screen from the projector. what gives and what can i do to change it. i have tried to change the "settings" with the displays, but doesn't change anything.
Comments
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Are you presenting on a PC or on a Mac?
In either case, the process is essentially the same. You'll want to go On-Air and then drag the Presentation (additional) screen to the Projector. Typically, the Projector acts as a second monitor.
Thanks,
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