ZCM 11.1a upgrade to 11.2

Hi there!

I am having troubles Upgrading the ZENWorks Primary server..

After i mount the .iso File for the Installation of the 11.2 (SP2) Upgrade and start the installation, everything goes fine.
At the End of the GUI-Install i get the "Congrats you Upgraded Succesfully to 11.2 SP2" message, then the ZENWorks 11 Server Reboots.

After the Reboot the ZEN-Loader Service is not coming up and the Management Console doesnt start either...
However the Services can't be started manually either...

Is there anything i might have forgotten to do before the Upgrade?
Or is there a way to fix this?

Thanks for your help!