SuSE 9.1 crashes after KDE logout

Hello all, I've this weird problem with my SUSE 9.1 pro. Every now and then when I log out KDE it freezes. The computer is so dead that I can't even do anything and I have to restart it. I'm not sure where I must start to debug it. I couldn't find uot anything wrong in /var/log/messages just before the freezing.I have a samba server 3.0.9-2.6 on it but apart from that I'm not doing any kind of networking. I have installed all the pathces via YaST but see no Difference. I would be grateful if somebody could shed light on it. regards Hamid -- QOTD: "I only touch base with reality on an as-needed basis!"