Windows Server 2011 is shutdown automatically

Hi There

We've got a SBS 2011 Server wich is shutting down frequently each weekend and don't reboot again.
There are no Errors shown in the Eventlog. Updates are swiched off.

Hope you can help me.

Who is Participating?
VollenweiderConnect With a Mentor Author Commented:
There was the Old DC still running. And so the new server rebooted.

Case closed
Kiran ChCommented:
Is there any antivirus installed and try disabling it this weekend.
Also you can search for *.dmp files if they got created and then read them by using windbg program.
VollenweiderAuthor Commented:
I've tried to find the .dmp files. But there is nothing in the folders.
We planed to switch off the anti virus next weekend.

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Is a IBM server?
VollenweiderAuthor Commented:
No a HP ML 370 G5
VollenweiderAuthor Commented:
We switched off the the AV and Windows Update but the Server Reboots again.
Maybe someone has some inputs?
VollenweiderAuthor Commented:
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