Please help grimo =)

[grimo]

    HorizSync   31.5 - 50.0

#    HorizSync	30-64         # multisync
#    HorizSync	31.5, 35.2    # multiple fixed sync frequencies
#    HorizSync	15-25, 30-50  # multiple ranges of sync frequencies

# VertRefresh is in Hz unless units are specified.
# VertRefresh may be a comma separated list of discrete values, or a
# comma separated list of ranges of values.
# NOTE: THE VALUES HERE ARE EXAMPLES ONLY.  REFER TO YOUR MONITOR'S
# USER MANUAL FOR THE CORRECT NUMBERS.

    VertRefresh 40-90

EndSection


# **********************************************************************
# Graphics device section
# **********************************************************************

# Any number of graphics device sections may be present

Section "Device"
    Identifier  "VESA Framebuffer"
    Driver      "vesa"
    #VideoRam    4096
    # Insert Clocks lines here if appropriate
EndSection

# **********************************************************************
# Screen sections
# **********************************************************************

# Any number of screen sections may be present.  Each describes
# the configuration of a single screen.  A single specific screen section
# may be specified from the X server command line with the "-screen"
# option.
Section "Screen"
    Identifier  "Screen 1"
    Device      "VESA Framebuffer"
    Monitor     "My Monitor"

# If your card can handle it, a higher default color depth (like 24 or 32)
# is highly recommended.

#   DefaultDepth 8
#   DefaultDepth 16
   DefaultDepth 24
#   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)

    Subsection "Display"
        Depth       8
        Modes "1680x1024" "1680x1024" "1680x1024"
    EndSubsection
    Subsection "Display"
        Depth       16
        Modes "1680x1024" "1680x1024" "1680x1024"
    EndSubsection
    Subsection "Screen 1"
        Depth       24
        Modes "1680x1024" "1680x1024" "1680x1024"
    EndSubsection
    Subsection "Screen 1"
        Depth       32
        Modes "1680x1024" "1680x1024" "1680x1024"
    EndSubsection

EndSection

[oz]

Are you sure those are the correct refresh rates?

Also, you might have better luck using the generic nv driver, or the official nvidia driver if it's been installed.

[devils casper]

HorizSync   31.5 - 50.0
VertRefresh 40-90

Are these Refresh rates supported by your Monitor? Check Monitor's Manual.
Try nv instead of vesa driver.

Section "Device"
    Identifier  "VESA Framebuffer"
    Driver      "nv"
    #VideoRam    4096
    # Insert Clocks lines here if appropriate
EndSection