FCP won't recognize DSR 1800 deck

I'm having a problem getting my Sony DSR 1800 DVCam deck to be recognized by my Final Cut. I just got a new Mac Pro, Dual Quad-Core Intel Xeon, 10.5.6 running FCP 6.0.5. I never had a problem with the old G5 but the new computer will not see the deck. The DSR 1800 connects via a Firewire 400 cable. Since the MacPro only has Firewire 800, I got an 800 to 400 cable to connect. No luck. Then I installed a PCI Express card with a 400 port. Still no luck. The new 400 port does work since it recognizes an external Firewire drive when plugged in.
I found something online about deleting Quicktime Receipt files but there were none in the Receipts folder.
I called the FCP support line at Apple, but they were no help at all. Basically said "sorry". Does anyone have any ideas?
Thank you very much for your help.