LCD Nvidia resolution/refresh problem

I got a problem.

I tried many times, reading every solved problem similar to mine and I cant make it work.

Everytime I restart the system, my res goes back to 800x600@72, and I want to keep my 1400x900 also I cant set the refresh rate to 75 always is set as auto and if I try to select only shows 60Hz. I edited the file as root, with gedit, nvidia-settings, even before ubuntu starts using the console... but still not working.

I have a video card Nvidia 6600GT and a LG W1934S LCD Monitor the max res is 1400x900@75 http://www.lge.com/products/model/detail/w1934s.jhtml

any idea? thanks a lot!

this is my Xorg.conf file
# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 1.0 (buildd@palmer) Mon Nov 3 08:46:46 UTC 2008

# xorg.conf (X.Org X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# Note that some configuration settings that could be done previously
# in this file, now are automatically configured by the server and settings
# here are ignored.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg

Section "ServerLayout"
    Identifier "Layout0"
    Screen 0 "Screen0" 0 0
EndSection

Section "ServerFlags"
    Option "Xinerama" "0"
EndSection

Section "Monitor"
    Identifier "Configured Monitor"
EndSection

Section "Monitor"
    Identifier "Monitor0"
    VendorName "Unknown"
    ModelName "CRT-1"
    HorizSync 30.0 - 83.0
    VertRefresh 56.0 - 75.0
EndSection

Section "Device"
    Identifier "Configured Video Device"
    Driver "nvidia"
EndSection

Section "Device"
    Identifier "Device0"
    Driver "nvidia"
    VendorName "NVIDIA Corporation"
    BoardName "GeForce 6600 GT"
EndSection

Section "Screen"
    Identifier "Default Screen"
    Device "Configured Video Device"
    Monitor "Configured Monitor"
    DefaultDepth 24
EndSection

Section "Screen"

# Removed Option "metamodes" "1440x900_75 +0+0"
    Identifier "Screen0"
    Device "Device0"
    Monitor "Monitor0"
    DefaultDepth 24
    Option "TwinView" "0"
    Option "metamodes" "1440x900 +0+0; nvidia-auto-select +0+0"
    SubSection "Display"
        Depth 24
    EndSubSection
EndSection

The Option "metamodes" "1440x900_75 +0+0; nvidia-auto-select +0+0" changes to Option "metamodes" "800x600_72 +0+0; nvidia-auto-select +0+0" everytime i restart the system.