Hi…Im having the same problem…
I tryed every slot and changed the configuration on the Expansion utilities as well.
The card is in the top slot though.
Im using the PCIe cable youve supplied.
It works when it is connected via USB to the Mac.
The software allow me to change the settings on the Multibridge and not be greyed out.
And last thing…when I connect the DVI cable the fan starts and stops..and the red light goes off.
Its like tryin to get on but just blinks.
When I unplug the DVI cable, the units comes back to normal.
any ideas??
thnx