LG L246WH 24" LCD won't allow selection of native resolution

I have a 20" Cinema Display (connected via a MiniDisplayPort to DVI Adatper) and an LG L246WH connected to the GT120 in my new Mac Pro - System profiler sees it as:
NVIDIA GeForce GT 120:
Chipset Model: NVIDIA GeForce GT 120
Type: Display
Bus: PCIe
Slot: Slot-1
PCIe Lane Width: x16
VRAM (Total): 512 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0640
Revision ID: 0x00a1
ROM Revision: 3386
Displays:
L246WH:
Resolution: 1920 x 1080 @ 60 Hz
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Rotation: Supported
Television: Yes
Cinema:
Resolution: 1680 x 1050
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Rotation: Supported
But the LG's native resolution is 1920x1200, not 1080. My MacBook Pro drove it happily at that resolution, but the GT120 seems to see it as a 1080p device only. How do I go about getting the Mac Pro to recognise it properly?

I am having very similar problems and it is a complete nightmare.
from another post
Just bought two great monitors from Fujitsu/Siemens. 26 Inch Each.
Also I got the MacPro with a.m- graphic card. This is a horror show. And it does not work.
I have them hooked up with DVI. Each work fine on their own with their max resolution which is full HD - 1920 * 1200.
So when I hook both up the main will show the gray apple boot screen. As soon as Login Window appears, both screens will go black and I have to power cycle the mac as I cant see a thing. If I boot into safe mode, one monitor will come up. If I set that to - 1280*720 and do a reboot - this time into normal boot. The 1280 * 720 screen will appear but the other will remain black. If I open display prefs. and set the black screen to 1280*720 I can use em both. Goes without saying that such a setting aint no fun and totally useless on a 26Inch screen.
Soon as I try and set any of the screens to native max size - the go black on reboot.
I dont know what to do. At all.
Hooking those displays up on my old harpertown 8 core - is working fine.
The specs of the graphic card states that I should be able to run that setup.
I am pretty disappointed in this. Any help would be appreciated.

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