Login screen not showing up

[Michael Lai <ml michael lai name>]

Not sure what I have done but I installed Fedora 4 several weeks ago and 
everything was fine.  However, a couple of weeks ago I suddenly can't 
see my login screen anymore.  I can see my system booting up and I can 
see the show/hide details screen and then I get a blank screen when all 
the services are started.  I don't know where to begin to analyze this 
problem.  Right now, I am relying on ssh to remotely login to my 
server.  Thanks for any possible help.