I am capturing HDV 1080i in FCP 6.0.1 on a Mac Pro running Mac OSX 10.4.11. When capturing the picture breaks up with horizontal, partially green, pixellated lines appearing across it. This is not a problem with the original footage which plays normally elsewhere. I have used both a HDV tape deck and also a camera as a deck. I have swapped the firewire and used a brand new firewire and put them in different sockets on the Mac. It still occurs. The the capture preset is definitely right. The breakup appears in the capture window and also on captured footage.
I have many other identical edit suites capturing the same footage that do not have this problem. Does this suggest a hardware issue with the Mac? Any help or advice much appreciated.