Startup of X fails

[mjwatson@snafu.livenet.net (MJ Watson)]

After installing 2.0 clean onto my PC, attempts to start up any
window manager fails, as does just trying to start an xterm.

This output is from an attempt to start up fvwm2:

-----------------------------------------------------


[FVWM][main]: <<ERROR>> Unknown option:  `:0'

[FVWM][main]: <<ERROR>> Unknown option:  `-auth'

[FVWM][main]: <<ERROR>> Unknown option:  `/root/.Xauthority'


Fvwm Version 2.0.46 Usage:

  X [-d dpy] [-debug] [-f config_cmd] [-s] [-blackout] [-version] [-h]

[FVWM][main]: <<ERROR>> can't open display 
_X11TransSocketUNIXConnect: Can't connect: errno = 2
_X11TransSocketUNIXConnect: Can't connect: errno = 2
_X11TransSocketUNIXConnect: Can't connect: errno = 2
_X11TransSocketUNIXConnect: Can't connect: errno = 2
_X11TransSocketUNIXConnect: Can't connect: errno = 2
_X11TransSocketUNIXConnect: Can't connect: errno = 2
giving up.
xinit:  No such file or directory (errno 2):  unable to connect to X server
xinit:  No such process (errno 3):  Server error.

-----------------------------------------------------

Any suggestions?  XF86Setup seems to go OK, though it may have been done as
root, but I'm trying to start my windows as under my userid.  I'm not trying 
to run xdm, just doing a startx.

Thanks,
Michael
mjwatson@livenet.net