Standard 2008 restart with EventID 41

I had a very scary situation today, when on a server few months old, I had an event ID 41:

"The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly."

Now... The system is brand new, and in exvellent excellent condition. Everything flies on the network.

Could someone please instruct me how to find out what happened for the server to crash like this?

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If the server is powered off without first shutting down Windows, or if power is lost, this error can be logged. It's not a crash, a crash would have a crash dump created or some other error logged.

Your server has either lost power or been force shutdown. Ask around if someone could have done it, or tripped over the power cable (don't laugh, I've seen this once), check your UPS for power event around that time.
To clarify, it's usually an outside event that creates these error, and that's what the Event Log is telling you. Windows knows hardware and software errors and logs them correctly (usually), but it can not know what happens outside the server enclosure.

One thing that could cause this is a faulty, not redundant power supply. It could cause a power loss without external event... that's about all I can think of that could cause this error.

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mrmutAuthor Commented:
Thanks  a lot, I will ask around first time tomorrow morning. This kind of scared me, as everything just _stopped_. I never seen something like that. The entire network was like frozen.
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Sounds a lot like a power outage at the UPS level... Do you happen to have switches powered by the same UPS as this server ?
mrmutAuthor Commented:
If the UPS don't output power, it would cause this error on the server and losing power to one or more switches would definitely kill your network.

I would give a good look at that UPS.
mrmutAuthor Commented:
Thanks - it really does seem that the UPS is defective. We took it out, and will replace it in a few days.

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Windows Server 2008

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