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After installing Sarge all right (apparently) there's no xserver configured. I don't know why, as no message was shown during installation. I tried to use some tools as XF86Setup and XFConfigurator but none is present and none would install with apt-get. I also failed with dpkg --configure xserver-xfree86.
Try running "X" from console.
Usually it will return with some sort of error message, like "no screens found" or so.
When this happens, rename your /etc/X11/XF86Config-4 and use "xf86cfg -textmode" to make a new config. You might use your backupped config to verify each section of the X11 config.
There's always a logfile at /var/log/XFree86.0.log as well.