System logs are in multiple places.
cd ~/Library/Logs/CrashReporter/
See logs from user app crashes. Filename is the app.
cd /Library/Logs/CrashReporter/
See logs from user app crashes run /sbin/dmesg
See the boot messages from before syslogd starts vi /var/logs/system.log
See the syslogd output
defaults write com.apple.CrashReporter DialogType crashreport
defaults delete com.apple.CrashReporter DialogType