(In reply to comment #8)
> When I run "sudo Xorg -configure" I get:

Why -configure? You want to run the X server, not configure it. :)

What I'm looking for, but not seeing, is this line at the end of the X server
shutdown:

 (EE) Server terminated successfully (0). Closing log file.

So it seems like the X server either dies uncleanly for you, or hangs during
shutdown. In the former case, there should be more information in the X
server's stderr output. The latter case will be hard to debug without ssh
access I'm afraid.