Windows Server 2008 Shutdown with a 0x500ff Reason Code

I had a client that had a new Windows Server 2008 R2 server shutdown spontaneously.

In reviewing the logs, I saw where the system went into shutdown, but I couldn't tell why. All I had to go on was a 0x500ff reason code.

Resources I found to help diagnosis this issue included:

Systems Shutting Down with 0x500ff:
http://support.microsoft.com/kb/2001061

Shutdown codes:
http://msdn.microsoft.com/en-us/library/aa376885(VS.85).aspx

None of these were really helpful, though, because the problem was kind of my fault. You see, we had installed the server, but it wasn't in its final secured location. It was sitting in an empty office. An empty unlocked office.

When some kids came in to the facility to hang out and wanted to use a computer, they tried a few times to log in, couldn't, and powered the server down, since it wasn't "working".

Oops. Looks like I have to get the server physically secured sooner, rather than later.