Imac not detecting projector through bnc cable

I can not get the imac to output the resolution needed for the projectors. I need a way to force the imac to output 1280 x 800 to the VGA display. We have numerous locations where this is an issue. We do not have the luxury of running straight VGA cables to the projectors, thus the imac can not recognize the projectors. Please advise, how to make the imac function fluidly without detecting the projector.

Welcome to the Apple Discussions!
You might try capturing the projector's EDID with this device and then using it to notify the iMac to what display device it is connected;
http://www.gefen.com/kvm/dproduct.jsp?prod_id=4714
UPDATE - On closer look I see that this device appears to be DVI only. I have searched the developer's site but cannot find a similar device for VGA. Perhaps a phone call to the developer would alert you to a solution.
Dah•veed

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Pcantin wrote:
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Imac not detecting projector through bnc cable

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