Can somebody help me...

Before, i used IMAC for my catalyst V4 DV and DVCAM player as my video source thru firewire connection. I have no problem encountered on my shows.
Now i purchased a Mac pro 8core 2.26Ghz and installed the new cat software.
when ever i select the DV player as my video input, the program crash. In the future i'm planning to purchase a blackmagic card
Please tell me why and how to repair it.

Thank you..
EARNS