Quote:
Originally Posted by Bombardier 
So I tried the 4 pci to pcie - expansion thing. I used an old Tower chassis and a 500W psu.
When I tried it the first time it actually worked, but then everything got worse. If the expansion box was attached and powered up, the mac pro didn't boot. With the cable unplugged OR the expansion box unpowered, the mac pro did boot.
I got rid of the problem by plugging a second electric consumer inside the xp box, in this case an old hdd.
Don't ask me why, I don't understand it, but with the hdd attached to the xp-box-psu, everything works (for over a week now).
the mac pro does boot AND I can find all pt hd-cards in mac os AND protools does launch and work!
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Which 4 pci to pcie-expansion that worked are you talking about - its not that clear from your post.
I guess the one that didn't work with HD, is the PCI-PCIe-adapter to mount inside the computer...