I'm trying to start compiz on a Fedora 8 on KDE
compiz --replace
compiz (core) - Fatal: No GLXFBConfig for default depth, this isn't going to work.
compiz (core) - Error: Failed to manage screen: 0
compiz (core) - Fatal: No manageable screens found on display :0.0
[damarius@localhost ~]$ metacity --replace &
[1] 3073


Here is the xorg.conf output:

# Xorg configuration created by livna-config-display

Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
ModulePath "/usr/lib/xorg/modules"
EndSection

Section "ServerFlags"
Option "AIGLX" "on"
EndSection

Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "us+inet"
EndSection

Section "Monitor"
Identifier "Monitor0"
ModelName "Monitor 1280x1024"
HorizSync 31.5 - 81.0
VertRefresh 50.0 - 75.0
Option "dpms"
EndSection

Section "Device"
Identifier "Videocard0"
Driver "nv"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x960"
EndSubSection
EndSection

Section "Extensions"
Option "Composite" "Enable"
EndSection


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i'm guessing it's the driver's fault.
So what driver should I install?
I tried
yum install xorg-x11-drv-nvidia-96xx
but it says it conflicts with xorg-x11-drv-nvidia
I'm using GeForce 4 mx 440

Are you trying to run it as root, or are you running the x-server as root?

I'm trying to start compiz as a normal user
It appears that the X server is run as root.

Did you start it as root?
You shouldn't do that.
Start it as user and at least that error should go away.

What if you just add compiz to System > Preferences > Sessions ?