First, change the permissions on your screen: (as root)
# sudo chmod a+rw /dev/ttyE0
Then use this to start Xwindows:
# startx -- -dev=/dev/ttyE0

I documented this at:

http://hpcmips.screamingserver.com/z50wiki/AndyZ50

--On Monday, April 08, 2002 3:21 PM -0600 Chris Jones <chris@cjones.org> 
wrote:

> This is weird; I can run startx as root, but it doesn't work as a
> "mortal" user.  When I run it as me, I get:
>
> Fatal server error:
> no screens found
>
> But I can see with ktrace that it's running Xwrapper, which is
> suid-root.  Shouldn't this work?