OK, it now works. I removed the battery. The camera went dead, but then lo and behold turned on again using external power. I then had to unattach the firewire cable and reattach it. I don't know why vista should make the expresscard behave differently with the power. I would obviously make more sense to have it working like before when the camera could use external power without having to remove the battery.
I guess I could have tried this before the original post.
Some windows based FW solutions do not provide sufficient firewire power to reliably power a high-end digital back. See
this list of supported and tested firewire cards.
If you are unsure of your FW solution you can always use [Configuration > Power Source > Battery] to use the back's internal battery rather than the firewire for power.
Doug Peterson
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Head of Technical Services, Capture Integration
Phase One, Leaf, Canon, Apple, Profoto, Eizo & More
National: 877.217.9870 | Cell: 740.707.2183
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