10.5.2 won't send signal to external projector

Help! I do speaking engagements for a living and just updated to 10.5.2. When I hook an external projector to the computer (DVI to VGA) my MacBook Pro does see the external projector, but will not send a signal to it. It worked yesterday, but as soon as I upgraded it no longer works. We tried a second Mac running 10.5.1 and it worked fine.
I have an engagement Wednesday evening and MUST have this fixed or I will be forced to buy a new computer. Don't have system disks to go backwards with updates. Anybody have any ideas? What a nightmare. I'm desperate to have a computer that will send a video signal out. It sees a monitor, but doesn't see the projector.

Howdy chadnodoubt,
If you are having an issue with your external display not performing as expected when connected with your MacBook Pro, I would suggest that you troubleshoot using the steps in this article -
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Thanks for using Apple Support Communities.
Best,
Brett L

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TeknoAXE wrote:
...The inside of the VI is an orchestration of sequences and loops that allows user full control through one control loop that cycles through until the user selects a desired function, for which the loop terminates and performs the function. After the function is complete, if the user has not pressed "stop", another loop brings the program back to the control loop.
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TeknoAXE wrote:
The problem, I've found, is that I don't know how to send signals to the Sub-VI from the connected controls at a constant rate without throwing it into a loop itself, which doesn't work because, of course, the sub-vi runs on it's own set of loops and there will be no iteration increment until the program inside the sub-vi terminates.
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TeknoAXE wrote:
Or, if the VI and it's inputs are left on it's own and I try to write values to the controls of the inputs, I can definitely change button positions, but, looking at the signal flows, no signal will be sent from the connected controls to the sub-vi.
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TeknoAXE wrote:
A second problem is that, due to my use of a program button that latches when pressed, I'm having a tough time trying to manipulate it will local variables or property nodes. Because of the way it functions, the "value" property nodes shows up as purple and I'm not sure how to make it tap itself to operate how it did in the Sub-VI.
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10.5.2 won't send signal to external projector

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