Suggestion 1) Post the exact text of the error messages.
Suggestion 2) Try demsg. Look for errors, and post those as well.
Suggestion 3) cd to /var/log, and examine the log files therein. You may have to su to root, and use the cat command to look into some of those files. If you find error messages, post those as well.
The problem as you have stated lacks vital information. Help us understand the problem, and some of us will probably be able to help you solve that problem.