Horizontal lines on Apple Cinema display

Hi,
I'm using a 23" Apple Cinema HD Display as a 2nd monitor hooked up to 17" Macbook Pro 2.8GHz/7i via the mini display port. When I play out ProRes from the timeline with the external display set as Digital Cinema Desktop Preview, the image looks sliced horizontally, approximately in thirds, very noticeable when something is moving. It looks like a refresh issue, parts of the screen showing adjacent frames.
I'm befuddled because surely the latest MBP has ample video processing power. The Cinema Display is not latest generation LED (it's 2008), but I understand the MBP & Cinema Display is a tried and tested combination.
The media is on an external drive connected by firewire 800. I'm running FCP 6.0.6 with a Sequence of HDV captured to ProRes422(HQ). Actually, it shows the same issue displaying DV-PAL! I don't see the lines when I play full screen on the MBP (i.e via Digital Cinema Desktop Preview - Main).
Any ideas about how to fix?

Hi bogisan
To clarify, I mentioned in my original post that I'd tested with DV and got the same problem...
dewshi wrote:
Actually, it shows the same issue displaying DV-PAL!
Although I'm working with ProRes, I have already experimented with playing out DV on a DV timeline, which should be less demanding than ProRes, as you're suggesting.
It doesn't look to me like the familiar cheese-grater artefact associated with interlacing issue as there's only one break in the image, rather than mismatching alternative lines when there is horizontal motion. I've tried different sequence settings for the field order, with no difference.
I'm wondering if the display is out of sync? It literally looks like the screen has been sliced by a razor 1/3 of the way down, and the bottom part is a different frame to the top. It happens when I scrub through the timeline too, but stabilises once parked on single frame.
By the way, I've also checked that the MBP has switched to the NVIDIA card rather than the slower, less energy consuming Intel video card.
Will check out the MBP forum too...
Thanks

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