Problem with resolution of external display

Hi,
I am trying to use external display with my Unibody Aluminium Macbook Pro (NVIDIA GeForce 9400M, 2.26Gh, snow leopard). Cable setting I use is quite complicated as it is: macbook: minidisplay port>hdmi> DVI D : display. Display is LG Flatron W2242T (4:3).
So I hooked everything up and macbook detected display without any problem. The problem arises when it comes to resolution. Maximum resolution I can set (and in fact the only except 800xsomething) is 1152x870 and not only it is to low, but also it does not respect 4:3 ratio so it looks quite bad. So bad, that i cant really work on a setup like that. When I try to change resolution to any other, Display goes black. I tried using some apps, but they dont really work.
What can be the problem here? Is it connection?
I would appreciate any help.

And once you've cut thru the clutter of cables and adapters, remember the max you will be able to push the Flatron is its "native resolution", that happens to be:
Screen Size
22"
Screen Type
TFT LCD
Wide Screen
Yes
Brightness
300cd/m²
Contrast Ratio
8000:1
Viewing Angle
(Horizontal/Vertial)
160/160
Response Time
5ms
Resolution
1680X1050
Supported Colours
16.7M Colours
(data taken from LG's product page)
If you happen to have a late model MBP with the widescreen option, the Mac and the display will be on a 1:1 ratio, both are the same. Else, if you have a regular MBP, the monitor has more resolution than the Mac (1440x900) and distortion will occur if you do video mirroring.

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