Problème de config à trois écrans

J'ai installé une Mandriva 2007 et je galère pour configurer mes trois écrans

j'ai une carte vidéo Gforce4200 Ti avec un écran CRT Philips 107P5 + un écran LCD Philips 150S
une carte vidéo S3 Savage4 avec un écran Proview 17"

La disposition est la suivante : à gauche LCD Philips, au centre CRT Philips, à droite CRT Proview

J'arrive à faire fonctionner les deux CRT mais pas le LCD. QUand je passe par nivida-setup pour configurer le LCD, X plante au démarage. Quand je tente de modifier xorg.conf à la main, c'est la cata...

Si une âme charitable voulait bien m'aider à écrire ce satané fichier :

# File generated by XFdrake (rev 57713)

# **********************************************************************
# Refer to the xorg.conf man page for details about the format of
# this file.
# **********************************************************************

Section "Files"
# font server independent of the X server to render fonts.
FontPath "unix/:-1"

# minimal fonts to allow X to run without xfs
FontPath "/usr/share/fonts/misc:unscaled"
EndSection

Section "Extensions"
Option "Composite"
EndSection

Section "ServerFlags"
#DontZap # disable <Crtl><Alt><BS> (server abort)
AllowMouseOpenFail # allows the server to start up even if the mouse does not work
#DontZoom # disable <Crtl><Alt><KP_+>/<KP_-> (resolution switching)
EndSection

Section "Module"
Load "dbe" # Double-Buffering Extension
Load "v4l" # Video for Linux
Load "extmod"
Load "type1"
Load "freetype"
Load "glx" # 3D layer
EndSection

Section "InputDevice"
Identifier "Keyboard1"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "fr"
Option "XkbOptions" "compose:rwin"
EndSection

Section "InputDevice"
Identifier "Mouse1"
Driver "mouse"
Option "Protocol" "ExplorerPS/2"
Option "Device" "/dev/mouse"
EndSection

Section "Monitor"
Identifier "monitor1"
VendorName "Plug'n Play"
ModelName "PHILIPS 107P5"
HorizSync 30-97
VertRefresh 50-160

# TV fullscreen mode or DVD fullscreen output.
# 768x576 @ 79 Hz, 50 kHz hsync
ModeLine "768x576" 50.00 768 832 846 1000 576 590 595 630

# 768x576 @ 100 Hz, 61.6 kHz hsync
ModeLine "768x576" 63.07 768 800 960 1024 576 578 590 616
EndSection

Section "Monitor"
Identifier "monitor2"
VendorName "Philips"
ModelName "Philips 150S"
HorizSync 30-61
VertRefresh 56-75

# TV fullscreen mode or DVD fullscreen output.
# 768x576 @ 79 Hz, 50 kHz hsync
ModeLine "768x576" 50.00 768 832 846 1000 576 590 595 630

# 768x576 @ 100 Hz, 61.6 kHz hsync
ModeLine "768x576" 63.07 768 800 960 1024 576 578 590 616
EndSection

Section "Monitor"
Identifier "monitor3"
VendorName "Plug'n Play"
HorizSync 30-61
VertRefresh 56-75

# TV fullscreen mode or DVD fullscreen output.
# 768x576 @ 79 Hz, 50 kHz hsync
ModeLine "768x576" 50.00 768 832 846 1000 576 590 595 630

# 768x576 @ 100 Hz, 61.6 kHz hsync
ModeLine "768x576" 63.07 768 800 960 1024 576 578 590 616
EndSection

Section "Device"
Identifier "device1"
VendorName "nVidia Corp."
BoardName "NVIDIA GeForce4 (generic)"
Driver "nvidia"
Screen 0
BusID "PCI:1:0:0"
Option "DPMS"
EndSection

Section "Device"
Identifier "device2"
VendorName "nVidia Corp."
BoardName "NVIDIA GeForce4 (generic)"
Driver "nvidia"
Screen 0
BusID "PCI:1:0:0"
Option "DPMS"
EndSection

Section "Device"
Identifier "device3"
VendorName "S3 Inc."
BoardName "S3 Savage4"
Driver "savage"
VideoRam 4096
Screen 0
BusID "PCI:0:9:0"
Option "DPMS"
# Option "no_accel" # You may enable this if there are timeouts when starting X
EndSection

Section "Screen"
Identifier "screen1"
Device "device1"
Monitor "monitor1"
DefaultColorDepth 24

Subsection "Display"
Depth 8
Modes "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection

Subsection "Display"
Depth 15
Modes "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection

Subsection "Display"
Depth 16
Modes "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection

Subsection "Display"
Depth 24
Modes "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection
EndSection

Section "Screen"
Identifier "screen2"
Device "device2"
Monitor "monitor2"
DefaultColorDepth 24

Subsection "Display"
Depth 8
Modes "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection

Subsection "Display"
Depth 15
Modes "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection

Subsection "Display"
Depth 16
Modes "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection

Subsection "Display"
Depth 24
Modes "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection
EndSection

Section "Screen"
Identifier "screen3"
Device "device3"
Monitor "monitor3"
DefaultColorDepth 24

Subsection "Display"
Depth 8
Modes "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection

Subsection "Display"
Depth 15
Modes "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection

Subsection "Display"
Depth 16
Modes "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection

Subsection "Display"
Depth 24
Modes "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection
EndSection

Section "ServerLayout"
Identifier "layout1"
InputDevice "Keyboard1" "CoreKeyboard"
InputDevice "Mouse1" "CorePointer"
Screen "screen1"
Screen "screen2" RightOf "screen1"
Screen "screen3" LeftOf "screen1"
Option "Xinerama"
EndSection