Dual monitor not working under Boot Camp on Mac Pro ATI HD 2600 XT

Recently got a brand new Mac Pro with ATI Radeon HD 2600 XT graphics card.
On the Mac side (Leopard), everything works perfectly: my second monitor (a plasma screen connected with HDMI to the second DVI of the ATI card via HDMI/DVI adapter) is fully recognized and it works as an extended desktop or in Mirroring mode.
Under Boot Camp (Windows XP Pro) however, NOTHING: the second monitor always appears in the display properties, but it is grayed out (inactive), and when I try to activate it, it switches back to being grayed out immediately and nothing gets displayed on it.
After reading all the posts I can find on the topic, I tried the following (in pretty much every possible combination - Thank god for WinClone that allows me to restore the Boot Camp basic install image without having to reinstall Windows from scratch every time):
a) Bootcamp 2.0 (installed by default by Bootcamp assistant)
b) Update to Bootcamp 2.1
1) Windows XP Pro SP2c vanilla install (from my Windows XP pro install disk)
2) Update to Windows XP SP3 (I tried with and without BC 2.1: both worked -> BC 2.1 didn't seem to be required for SP3 - maybe because this is a mac pro and not a MB or MBP)
i) ATI drivers installed by default by Boot Camp assistant (BC 2.0) or by BC 2.1
ii) Latest ATI drivers found on ATI web site specifically under Boot Camp / Mac Pro.
Note: Interestingly, the catalyst installer worked ok (provided .NET framework 2.0 is installed though), but it seems that the Radeon BootCamp/Mac Pro driver set itself from ATI's web site does NOT include a driver for the HD 2600 XT - so when I install this driver set, it tells me that no compatible hardware was found...
iii) Latest ATI drivers found under Windows XP (these did include one driver specifically for the Radeon HD 2600 XT)
NOTHING seems to work. I read posts (most of the from late last year) about ATI Catalyst utility showing a 3rd monitor at some point, but I never got any 3rd monitor showing in any of my many many trials with Catalyst. I have yet to get a single image appear on my plasma under Bootcamp Windows. I don't believe its the hardware because everything works great on the max OS X side.
I am actually considering switching to an NVidia 8800 GT just to get the dual screen to work under BootCamp/Windows XP because I really need it and I read everywhere that drivers for NVidia are far better than ATI ones.
Any advice? What should I try next before getting an 8800 ?
Is there a diagnostic utility that I can use to test my config including the GC?
Thanks!

Hi there aside from my laptop I have an iMac 20" with the same HD 2600 XT card. I recently installed the Catalyst 8.6 driver by using a driver mod from driverheaven, I use Vista 32. By installing it this way I got boosted performance and many issues with the bootcamp drivers were fixed. As you may already know the ATI drivers do not install on bootcamped macs usually but the mod tool fixes this. Its unofficial so do so at your own risk but try it out and see if you get the second monitor if not just rollback. Hope this helps and I didn't want to say too much about the 8.6 driver mod because it may not be allowed here but google will provide any answers.

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