Powering Down on Restart

I did a rare restart on my Mac Mini. It would start to come back up and then power off. It did this four or five times before comming back up. Each time there would be a progress bar that would progress all or part way to completion before it disapeared and then powered off after a few seconds. I had done a shut down and power up earlier in the day without issue. Prior to the restart, I installed a LaCie 2Big RAID via Thunderbolt and moved a few hundred GB of files to it. I also had a couple of crashes after I first installed it. I'm concerned it's the cause of my problems. Any idea why a restart would power off part way through?

A follow up on this problem. I had it happen a second time. When the OS finally came back up both times, one app complained of a crash and another took more time to come up than usual indicating it might be recovering as well. Today, I closed all my apps and then did a restart. It came back up normally. Either the OS fixed itself on the prior restart or an app is causing a problem. Is there any log information to look at? I'll try closing apps selectively before retarting to see if I can find the problem assumming it is an app.

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