I have the same problem again, I have tried no1tmorrow and E.J. Sexton suggestions. It was worked last time I get this error, but not this time. I have found a solution, and I am writing here for the record.
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Let me explain my case:
The server was running without problem, after Windows Server update the problem occurred. Database can not be started. There wasn't any error code in event log file. The last entry was like below:
2014-07-24 08:02:15.911 +0300 Information 406 fmserver Starting FileMaker Database Engine...
After dozens of reinstalling and restarting process, I have looked FileMaker Server Service from services window. I changed Log On settings of FileMaker server Service like the image below. And now FM Server is running works.
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Server specs for this case is : FileMaker Server 11 on Windows 2012 Standard. 2,13 Ghz Xenon processor with 16 GB of ram.