Low display resolution

[Welly Hartanto <welly@xxxxxxxxxxxxxxxxxxx>]

Hi, all...
I'm a newbie in linux. I've been using Linux ( Debian 3 ) for about 2 
months.
And now, I have a problem about my display . I'm trying to install 
Debian into my old PC ( not very old actually..) with :

- Intel 845G Chipset.
- 256 MB DDR.
-Onboard graphic adapter ( the Intel 810 ).
-Realtek LAN.
-Samsung SyncMaster 551v monitor.

After I'm installing X and decided to use Gnome foe my desktop, I've got 
only 640 x 480 resolution on my display ( I don't know the depth, 
probably 16 bit or even 256 colors ).
I've tried to do any configurations, but it didn't work. I'll be very 
happy if you guys help me out...Thanx.
Below is the XFree86Config-4 of my configuration,  :
--------------------------------------------------------------------------------------------------------------------------

Section "Files"
   FontPath    "unix/:7100"            # local font server
   # if the local font server has problems, we can fall back on these
   FontPath    "/usr/lib/X11/fonts/Type1"
   FontPath    "/usr/lib/X11/fonts/CID"
   FontPath    "/usr/lib/X11/fonts/Speedo"
   FontPath    "/usr/lib/X11/fonts/misc"
   FontPath    "/usr/lib/X11/fonts/cyrillic"
   FontPath    "/usr/lib/X11/fonts/100dpi"
   FontPath    "/usr/lib/X11/fonts/75dpi"
EndSection

Section "Module"
   Load    "GLcore"
   Load    "bitmap"
   Load    "dbe"
   Load    "ddc"
   Load    "dri"
   Load    "extmod"
   Load    "freetype"
   Load    "glx"
   Load    "int10"
   Load    "record"
   Load    "speedo"
   Load    "type1"
   Load    "vbe"
EndSection

Section "InputDevice"
   Identifier    "Generic Keyboard"
   Driver        "keyboard"
   Option        "CoreKeyboard"
   Option        "XkbRules"    "xfree86"
   Option        "XkbModel"    "pc104"
   Option        "XkbLayout"    "us"
EndSection

Section "InputDevice"
   Identifier    "Configured Mouse"
   Driver        "mouse"
   Option        "CorePointer"
   Option        "Device"        "/dev/psaux"
   Option        "Protocol"        "ImPS/2"
   Option        "Emulate3Buttons"    "true"
   Option        "ZAxisMapping"        "4 5"
EndSection

Section "InputDevice"
   Identifier    "Generic Mouse"
   Driver        "mouse"
   Option        "SendCoreEvents"    "true"
   Option        "Device"        "/dev/input/mice"
   Option        "Protocol"        "ImPS/2"
   Option        "Emulate3Buttons"    "true"
   Option        "ZAxisMapping"        "4 5"
EndSection

Section "Device"
   Identifier    "Generic Video Card"
   Driver        "vesa"   
EndSection

Section "Monitor"
   Identifier    "Generic Monitor"
   HorizSync    28-48
   VertRefresh    43-72
   Option        "DPMS"
EndSection

Section "Screen"
   Identifier    "Default Screen"
   Device        "Generic Video Card"
   Monitor        "Generic Monitor"
   DefaultDepth    16
   SubSection "Display"
       Depth        1
       Modes        "1024x768" "800x600" "640x480"
   EndSubSection
   SubSection "Display"
       Depth        4
       Modes        "1024x768" "800x600" "640x480"
   EndSubSection
   SubSection "Display"
       Depth        8
       Modes        "1024x768" "800x600" "640x480"
   EndSubSection
   SubSection "Display"
       Depth        15
       Modes        "1024x768" "800x600" "640x480"
   EndSubSection
   SubSection "Display"
       Depth        16
       Modes        "1024x768" "800x600" "640x480"
   EndSubSection
   SubSection "Display"
       Depth        24
       Modes        "1024x768" "800x600" "640x480"
   EndSubSection
EndSection

Section "ServerLayout"
   Identifier    "Default Layout"
   Screen        "Default Screen"
   InputDevice    "Generic Keyboard"
   InputDevice    "Configured Mouse"
   InputDevice    "Generic Mouse"
EndSection

Section "DRI"
   Mode    0666
EndSection


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