Banding occuring with Lacie 321 as external monitor?

Please help me.
I have just purchased a Lacie 321 lcd monitor and everything was splendid until I decided to take a look at my pictures. This phase of this story is crucial, as I am a professional photgrapher and this new lcd monitor will be used to edit photos.
To my horror, I can clearly see banding on my photos. Initially I thought it was the problem with the image, so I took a look at other images. Same result. These photos were fine with a CRT and now with the Lacie 321, they are all banded.
I don't know if anyone has experienced a similar problem with their external lcd/tft monitors with their 1.67ghz powerbook. By the way, this is the "last" powerbook model (right before macbookk pro).
From the looks of it, this seems to be a powerbook problem and not a monitor problem...
Any help will be appreciated.
Ryu

Louie,
Thanks for your reply.
I checked the system profiler and this is what I found:
ATI Mobility Radeon 9700:
Chipset Model: ATY,RV360M11
Type: Display
Bus: AGP
VRAM (Total): 128 MB
Vendor: ATI (0x1002)
Device ID: 0x4e50
Revision ID: 0x0000
ROM Revision: 113-xxxxx-169
Displays:
LaCie 321:
Resolution: 1600 x 1200 @ 60 Hz
Depth: 32-bit Color
Core Image: Supported
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Rotation: Supported
Display:
Status: No display connected
I also checked the setting and it is currently now set to:
-1600X1200
-Millions (32bit)
-60 Hertz
Does this mean that the display is functioning correctly, but there is something wrong with the PB video card?
Ryu

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Banding occuring with Lacie 321 as external monitor?

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