can change resolution

[Antonis]

well i m trying to fix this for weeks , but nothing!
i m new user at fedora 7,
when my system started for first time i had screen resolution 800*600
so, i wanted 1027*768 and i installed successfully livna drivers,and nvidia drivers.
But ,, now is only 640*480 !!
i changed xorg.conf many times but nothing,,, pls help me

here is my xorg.xonf

# Xorg configuration created by livna-config-display

Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
ModulePath "/usr/lib/xorg/modules/extensions/nvidia"
ModulePath "/usr/lib/xorg/modules"
EndSection

Section "ServerFlags"
Option "AIGLX" "on"
EndSection

Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "us,gr"
Option "XkbOptions" "grp:shifts_toggle,grp_led:scroll"
EndSection

Section "Device"
Identifier "Videocard0"
Driver "nvidia"
Option "AddARGBGLXVisuals" "True"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 16
Modes "1024x768"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024x768"
EndSubSection
EndSection

Section "Extensions"
Option "Composite" "Enable"
EndSection

[burgsprinta]

I use SUSE, but i'm going to assume this command is present in RedHat, too. In a console, login as root. run the command xf86cfg or xorgconfig (which ever is available on your distro) and run follow the directions given here. I had the same problem in SUSe and ended up having to use a generic VESA driver to powere may NVIDIA quadro, but in the end I got the resolution I was looking for.