X is restarting with increasing frequency: here are the last messages: [root@xxxxxx root]# tail /var/log/messages May 3 10:20:47 fish userhelper: pam_timestamp: timestamp file `/var/run/sudo/tom/unknown:root' is too old, disallowing access to redhat-logviewer for UID 500 May 3 10:28:21 fish su(pam_unix)[8945]: session opened for user root by tom(uid=500) May 3 10:33:10 fish modprobe: modprobe: Can't locate module char-major-97 May 3 10:33:11 fish last message repeated 3 times May 3 11:10:40 fish gconfd (tom-8832): Received signal 15, shutting down cleanly -- "Two of the most famous products of Berkeley are LSD and Unix. I don't think that is a coincidence."