Are you able to get into a terminal to type commands at all?
If not boot to a live disk. Mount the server drive.
Then print the log file of the server and post it here.
tail -f /var/log/messages -n 100
Note: /var/log/ folder will be within a drive path under /media or /mnt if you're using a live disk. That command prints the last 100 lines of the log. We may need to dig deeper but lets start with that.