resolution problem

[Antiz]

ok so i installed debian on my machine yesterday. Everything went smoothly untill the installation was finished and i was presented with the login screen. However the resolution seems to be way off and there is a big warning by my monitor that the resolution is out of range. The problem is that the warning is right in the middle of the screen and i cant see through it to log in to my system. Is there a way i can change something for the window to go away? Thanks in advance
I'm a linux newbie so be gentle with me please.

[devils casper]

Press Alt+Ctrl+F3. Does it switch to command line mode?
If yes, then login there and execute this

su -
Xorg -configure

[Antiz]

I tried that however it says that the mode i choose is unavailable. This happens to every mode i choose so i cannot resize. I managed to get into debian but the warning window is floatign around the screen and resolution cant be changed graphically from here either

[devils casper]

Try to set Resolutions manually in /etc/X11/xorg.conf file.
This is a sample xorg.conf file. It works fine with most of machines.

Section "Device"
       Identifier "Configured Video Device"
       Option "RenderAccel" "true"
EndSection

Section "Monitor"
         Identifier "Configured Monitor"
         HorizSync 31.5 - 50.0
         VertRefresh 40-90
         Option "UseEdidFreqs" "1"
         Option "ReducedBlanking"
EndSection

Section "Screen"
        Identifier "Default Screen"
        Monitor "Configured Monitor"
        Device "Configured Video Device"
        DefaultDepth 24
        Subsection "Display"
             Depth 24
             Modes "1280x1024" "1024x768" "800x600" "640x480"
        EndSubsection
EndSection

You can use any text editor to edit xorg.conf file.