PCI Express Video Through ExpressCard

Greetings.
I am part of a project that requires laptops to drive 3-6 displays. We figured out that my personal 2.16Ghz Core 2 Duo MBP running 10.4 has no problem driving a PCI express video card housed in an external (powered) box that utilizes the ExpressCard slot. Using this setup and the right video card, I can drive 3 30" monitors, one from the built-in dual-link DVI port, and 2 from the external video card. Or, I can drive one 30" and then 4 24" monitors from the external card. The performance and stability on both scenarios is truly excellent.
This was supposed to be one of our better solutions. We then bought new MBPs and found that the new ones can't do this! They simply won't boot if the expresscard video is connected. The new MBPs are 2.4Ghz using ROM MBP41.00C1.B03 and SMC 1.27f1. They run 10.5, although I don't think that matters since the failure occurs before OS loading begins (I think).
The failure mode is that I hear the first tone when the unit is first powered, but then no activity past that. No monitor lights up (not even the built-in), no noises, no hd activity, nothing. Removing the expresscard allows the MBP to act normally after a reboot, so no permanent effects.
I'd appreciate any help in solving this. It hurts to have spent the $$$ banking on 1-year newer MBPs to have at least the minimum capabilities matching my personal MBP. (Then there's the matter of egg in the face after convincing coworkers to go down this path.)
If there's no apparent fix, would forcing the new MBPs to use the old ROM as used in my personal MBP work?
Thanks.
Michael

Have you tried seating a different kind of PCIE card in the housing? How about with no card?
Joseph

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