Problem with Xorg [Amd64 + Nvidia]

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Hi everyone. I came here because i have a problem with xorg.
I've instaled Nvidia drivers for amd64 and my video card was supported.
But i have a problem. I can't put the display resolution bigger than 640*480. I want to put it in 1024 but it doesn't work :\
In the modes are ok but it doesn't allow me to put bigger.
Im just a noob and i would like to resolve my problem. If u could help me i would apreciate.

My xorg.conf:

Identifier "My Monitor"
HorizSync 31.5 - 43.3
VertRefresh 70.0 - 80.0
EndSection

Section "Device"

#VideoRam 4096
# Insert Clocks lines here if appropriate
Identifier "VESA Framebuffer"
Driver "nvidia"
EndSection

Section "Screen"

# If your card can handle it, a higher default color depth (like 24 or 32)
# is highly recommended.
# DefaultDepth 8
# DefaultDepth 16
# DefaultDepth 32
# "1024x768" is also a conservative usable default resolution. If you
# have a better monitor, feel free to try resolutions such as
# "1152x864", "1280x1024", "1600x1200", and "1800x1400" (or whatever your
# card/monitor can produce)
Identifier "Screen 1"
# card/monitor can produce)
Identifier "Screen 1"
Device "VESA Framebuffer"
Monitor "My Monitor"
DefaultDepth 24
Option "RenderAccel" "true"
Option "AGPFastWrite" "true"
# Option "NvAGP" "1"
SubSection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"

Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 32
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection



It's all. Thanks to all. Cumps

[Headrush]

Try removing the horizontal sync line and let the driver figure it out.

Is your monitor a CRT or LCD and is it connected via VGA or DVI?

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Its a CRT and it is connected throw vga
So u suggest reajusting the sync line?