figure a reboot is the natural response.
This isn't MSWin, a system reboot is rarely necessary if an app is having an issue.
Why don't you show us that instead.
Secondly, why don't you try the CLI approach when you are sitting in front of it, you'll be able to see any msgs then...
Also, check the various logs under /var/log.
I think the 'other' reboot cmd you wanted was