Never come across this one in my time with SBS 2011.
The server boots up fine to the Ctrl Alt Del screen. If you leave it there all email etc works fine, but if you login the screen goes black and the BIOS screen is displayed - it's reboot booting ungracefully.
Tried a different login -the same effect. Tried Remote Desktop - the same effect.
Some remote (RSAT) tools in Windows 10 work fine but none will give me access to the Desktop so that I can run MSConfig and Disable bootup items and non-Microsoft Services.
In the EventViewer the last thing before the Crash is
Windows cannot find the local profile and is logging you on with a temporary profile. Changes you make to this profile will be lost when you log off.
Tried Safe Mode but unable to login - No Netlogon service running.
The reason for the initial reboot was some window updates had gone on and it was asking for a reboot.
At a loss.
Thanks John.
12/03/19 Update - Came in early this morning and activated the Task to uninstall the last 3 Windows Updates installed on the Server. The Server did a graceful reboot and the PowerShell command:
Get-Hotfix -computername "SBSServer" | Select HotfixID, InstalledOn | Where-Object { $_.HotfixID -eq "kb4459934" } | Sort-Object InstalledOn
is now not showing them installed. Have not dared try to login, this will be done on Sunday - another crash this morning would be inconvenient.
I am taking today to duplicate critical Documents/ artwork/ accounts etc to a USB Drive, we have a native server backup but if I can have it in RAW form as well......
At the same time the migration to Exchange Online is progressing.