NVIDEA outputs digital signal to LCD projector

We are having a different problem with connecting to LCD projectors at our school. The problem seems to result from a Crestron media manager between the MBP and the projector. the MBP connects via the DVI-to-VGA adaptor. If the MBP has the NVIDIA GeForce 8600M GT card, it sends a digital signal to the projector and nothing shows up on the screen. Displays preference panel shows the 2nd monitor as "Digital 170T." There are 3 MBPs showing this behavior. one older MBP with an ATI Radeon X1600 card connects just fine. My G4 with an ATI Mobility Radeon 9700 also worked (for over 3 years). both show a "VGA" connection in Displays preference panel.
The NVIDIA MBPs can connect directly to an LCD projector and output a VGA signal that works. it seems that the intermediate Crestron system is not sending a signal that the NVIDIA requires to know it is connected to a VGA display. and of course, Crestron is telling our support people it is not their problem; NVIDEA's web support doesn't even touch Mac topics.
So how do we convince the NVIDIA card to output a VGA signal from the DVI port?

Nvidia Control Panel. Change the video output. Should work.

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