[CentOS] XORG and LCD Projector

dear guys,

I have a problem between my CentOS 5.5 (on Axioo notebook) and LCD
Projector. When I connect my notebook to LCD Projector, it can detect my
notebook.
But when I press Fn + F7 to activate dual monitor between my notebook and
LCD Projector it goes to blank screen. FYI, the LCD Projector is NEC but I
don't know the series.
I've tried to change display using dual head monitor but it has no effects.
Do I need some driver??

and this is my xorg configuration :
Section "Device"
        Identifier  "Videocard0"
        Driver      "openchrome"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes    "1280x800" "1024x768" "800x600" "640x480"
        EndSubSection
EndSection

Hope you guys can help me. Thanks.


Andrew.
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