Keynote not recognizing projector

Keynote 3 does not recognize my Epson projector. Using keynote 2 I merely plugged in and could show my slides with no difficulty. With Keynote 3 I get nothing but a blank screen. I have tried all the different Preferences settings. I get the same results trying to project through my home TV set. What am I not doing?
eMac   Mac OS X (10.4.7)  

Thanks. I have checked everything in the OS X and everything is OK. I can project Keynote through my TV set, so the problem has been with the projector - I should have started there. I needed to re-select my computer as the input source. Thanks again.
eMac   Mac OS X (10.4.7)  

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