Graphical boot gone awry

[Andrew Robinson <awrobinson@xxxxxxx>]

My graphical boot (rhgb) has somehow gone awry. Instead of either the 
image of the workstation or the window showing the boot messages, all I 
get is a black screen with the X-Windows "X" cursor in the center. It's 
like the graphical boot program has lost a configuration file and it 
doen't know what to display. My attempts to troubleshoot the problem 
have run into a sort of brick wall. There does not seem to be much 
information on rhgb available. Can someone offer a suggestion as to what 
I might have done or how I might find out what I've done?

Thanks!

Andrew Robinson