> What log file do I look at on my system to get a clue for the source > of the problem? Log files are in /var/log. You might want to look into syslog and kern.log attach it to your post if you need further help. When your system is locked, try ctrl+alt+backspace (it force restart X) or ctrl+alt+F1 and see if your computer is responding. Good luck Marc-Etienne