I don't know openSUSE, as indicated before, but following the normal directory structure, your logs are located in /var/log. So open a terminal and check /var/log/messages, /var/log/syslog using the commands less, more or open them in an editor for reviewing. Might I suggest you do some reading to get familiar with Linux since this is basic knowleged. This guide
is a very good starting point to learn the basics of Linux.