[Sussex] Cloned disk won't boot

[Brendan Whelan]

I created a mirrored copy of an FC6 system using the embedded program in 
a SATA raid controller. The cloned disk boots, switches to GUI mode and 
displays the login screen. When I login I get "Your session lasted less 
than 10 seconds....session_child_run: Could not exec 
/etc/X11/xinit/Xsession default"  "Could not start the session due to 
internal error"  The same happens in failsafe mode. As an aside, I got 
the same problem when I tried cloning by copying each partition in 
turn.  How can I overcome the problem? Thanks, Brendan