Originally Posted by moonbeam5
Fatal server error:
Server is already active for display 0
If this server is no longer running, remove /tmp/.X0-lock and start again
Xlib: connection to ":0.0" refused by server
Xlib: Invalid MIT-MAGIC-COOKIE-1key giving up.
xinit: unable to connect to X server
xinit: No such process (errno 3): Server error.
Did you try to do what the error says, and remove the temp file? At this point, probably what has happened is that the last time the xserver failed it left the file.
From what I know about your situation, I'd start by checking the video driver and settings in your xorg.conf file. In my experience, an improper or misconfigured driver could cause a computer to reboot spontaneously. This happens in both Windows and Linux.