Hi Team
This happened several times now: After doing the updates I pressed reconfigure and the server goes down but he does not start again  
What can I do?
I'm with Cactus.  It's very likely that you have a BIOS check that is failing, causing the pre-boot sequence to halt.  For example, some BIOS settings on certain hardware will halt the boot if a keyboard isn't attached to the system.  
Plug in a monitor to the machine and watch the system as it goes through a reconfigure/reboot.  If it is a BIOS check that is causing the system to halt, you can very likely disable the check in the BIOS settings.
GJZ