MacBook external display problem with Panasonic projector

MacBook (September 2006, Intel 945) with Boot Camp and XP Pro won't display externally from Boot Camp to a Panasonic PT-DW5000U projector using VGA (via the MiniDVI-to-VGA adapter/dongle). I tried 640x480x8-bit and 800x600x16-bit and 1024x768x16-bit. I tried unplugging and replugging the adapter. I tried shutting down and restarting into Win XP while all video cabling was connected. I tried pressing F7, Fn+F7, Shift+F7, FnShiftF7, as well as other key combinations involving F7. I tried checking the checkbox called "Extend my Windows desktop onto this monitor." I installed Apple Software Update 2.1. None of these troubleshooting attempts worked. It works fine in OS X to the same projector (using the same VGA dongle). And, while Win XP starts in Boot Camp, the projector displays the Windows XP startup screen (black background and blue progress indicator), but after about a minute that disappears, I get a login dialog on the laptop screen, and the projector then displays only a blank blue screen.
Other displays: It works fine with Boot Camp to a Samsung SyncMaster 940T monitor using DVI (via the MiniDVI-to-DVI adapter/dongle). It works fine with Boot Camp to a Panasonic LC50 monitor using VGA (via the MiniDVI-to-VGA adapter/dongle).
We also have Panasonic PT-D5500 projectors, but I haven't tried them yet.
1. Is this a problem in the Intel drivers supplied with Boot Camp?
2. Are there settings on the projector that need to be set to make it work?
3. I'm also now missing the Intel system tray icon that looks like a slanted computer screen -- how do I get it back?
Any suggestions? Thanks!

Based on the substantial research I've done regarding this issue, here's what the problem could be (without me knowing more):
If your working with an integrated graphics card (Intel 945?), chances are that it doesn't support the "resolution" of the projector - which is information embedded in to your other devices. Furthermore, the "refresh rate" is another piece of information usually "embedded" in to the device your connecting to, and the projector may not have either piece of information accessible to your card, or, vice versa.
Additionally, the drivers required by XP to make it all happen while using your particular video card, may not be installed. Basically, it could be a driver issue as well.
I wish I had a solution for you, however, everything I've read seems to conclude that XP within boot camp has little or no support for external displays (especially when talking about larger resolutions).
Humorously, when I addressed the "Mac Genius" at the Apple Store regarding this question, he told me to go buy a PC - so I did. Already have a Mac Pro, needed a laptop...

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By sheer luck, one of my newer acquisitions came with an OSX 10.4 install DVD, so I decided to take it for a spin in the G5 to see if it was really the graphics card or just some driver issue caused by the fact that the systems on the external drive were default installs pulled from other computers and not "universal" installs.
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