Shuts Down at Login on new Late 2012 21" iMac

I have a strange issue with my Late 2012 21" iMac, it has OS X Mountain Lion 10.8.2. The issue is this, if i turn on my iMac and then walk away for more than about 5 mins without logging in, it shuts down! it does not happen once I am logged in to OS X, I have never had this issue before with other Macs. Any ideas?
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More about shuts login late 2012 imac
  1. some kind of power saving feature?
  2. I don't this so, as I have checked the Energy saving options and there is nothing I can see there that would be doing that
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