gnome

[Richard Sara]

I have installed the Gnome desktop mega port and thought I followed  
the installation instructions corrects, but obviously not. I  have  
somehow got myself into an infinite loop at the GDM login screen,  
which sits on top of all other windows and, regardless of what user  
name/password combination I use refuses to all login. I have trawled  
through the pages I can find on this site, but I can't sort it out  
(which is not saying an answer is not here, I just don't know what I  
am  looking for). The GDM logon dialogue opens regardless of the user  
(admin/richard) so I have been looking in /Library, /Library/ 
LaunchDaemons and /Users/(username)/Library, /Users/(username)/ 
Library/LaunchDaemons but no luck.
I can't find an /.xinitrc file for any users.
All help gratefully accepted and acknowledged.