We've got 2 new Mac g5's and 2 new HVX 200's running OS X 10.5.4 and FCP 6.0 on both machines. The HVX's had been connecting fine via firewire through a firewire patch bay to ports in the video card (we have saffire boxes for audio on the main ports) but all of a sudden both cameras have stopped connecting to the Macs via firewire. we've tried all manner of combinations with different cables, connecting directly without the patch bay, with the saffire boxes, without them, in the video card slots, in the regular firewire slots but nothing works so far. The p2 cards don't even show up on the profiler, let alone on the desktop. USB works fine with the settings in menu #9 set to USB, and we can log footage quite quickly with it, but we're set up with all firewire paraphernalia. Has anyone else had any problems like this? Help would be greatly appreciated.