Server 2012 R2 won't boot

I have a customer with a Server 2012 R2 domain controller that wouldn't boot.  It would get to the logon screen and then, after a few minutes, reboot.

I booted into safe mode and, using MSCONFIG, concluded that the Security Accounts Manager service, SamSs, is the issue.  I set to run all services (Normal Start) except this one service and the computer boots.

With SamSs disabled many other services won't start.  

Any thoughts?
Sheldon LivingstonConsultantAsked:
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Anand PandyaCommented:
I would suggest you to boot with safe mode and once it is stable.
start in the normal mode, then goto msconfig and select the option normal startup in general option, and in services option only select microsoft required services and in bootoption also select required one, exclude third party applications.
Then observe the performance else you need to configure the dump, so that next time it reboots you can debug the dump and check.
Sheldon LivingstonConsultantAuthor Commented:
That is essentially what has been done.  Every service is enabled except SamSs and the computer will boot fine.  

Computer keeps rebooting if I enable SamSs.

There are no events logged when the computer keeps rebooting (if SamSs is enabled)... thus there are no clues as to why SamSs causes the computer to keep rebooting.

So many other services depend on SamSs.
Sheldon LivingstonConsultantAuthor Commented:
More information:

It appears that msiexec.exe is initiating a reboot to complete an install of "forefront identity manager password change notification service ".

Source user32 ID 1074
Sheldon LivingstonConsultantAuthor Commented:
Resolved myself.... needed to repair the Forefront Identity Manager application.

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Sheldon LivingstonConsultantAuthor Commented:
Solved myself
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Windows Server 2012

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