I do not know how to edit the X Config (hence I am new to Linux). I did type in startx -- -logverbose 5 in the Root Terminal and I got this:
Using authority file /tmp/libgksu1.2-4O4fc6/.Xauthority
Writing authority file /tmp/libgksu1.2-4O4fc6/.Xauthority
X: warning; process set to priority -11 instead of requested priority -10
Fatal server error:
Server is already active for display 0
If this server is no longer running, remove /tmp/.X0-lock
and start again.
When reporting a problem related to a server crash, please send
the full server output, not just the last messages.
Please report problems to firstname.lastname@example.org