xf86config-4 setup problems

[dave jk <dave.jk@ntlworld.com>]

Having just installed debian I have hit a problem.

I have a nvidia riva tnt2 model 64 card and a standard monitor
I answered all the questions on install but the XF86 crashed ...

In /var/log/XF86config I get ...

(II) Loading /usr/X11R6/lib/modules/linux/libfbdevhw.a
(II) Module fbdevhw: vendor="The XFree86 Project"
        compiled for 4.1.0.1, module version = 0.0.2
        ABI class: XFree86 Video Driver, version 0.4
(II) UnloadModule: "nv"
(II) UnloadModule: "fbdevhw"
(II) Unloading /usr/X11R6/lib/modules/linux/libfbdevhw.a
(II) UnloadModule: "vgahw"
(II) Unloading /usr/X11R6/lib/modules/libvgahw.a
(II) UnloadModule: "int10"
(EE) Screen(s) found, but none have a usable configuration.

Fatal server error:
no screens found

The important part of my XF86Config-4 file is ......

Section "Device"
        Identifier      "Generic Video Card"
        Driver          "nv"
        Option          "UseFBDev"              "true"
EndSection

Section "Monitor"
        Identifier      "Generic Monitor"
        HorizSync       31-54
        VertRefresh     56-85
        Option          "DPMS"
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Device          "Generic Video Card"
        Monitor         "Generic Monitor"
        DefaultDepth    16
        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
:

I have read the man pages,
I have checked and checked my config file ...
I have cross checked it with my working red hat XF86config-4 file
The default depth matches the "display" depth

everything checks out, still I have this problem ..

Any ideas ....
Dave