iMac Late 2012 Shuts down at login screen

[manic23]

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?

 

[cainehorr]

I am experiencing the same issue on a 17" MacBook Pro running 10.8.3 and a Mac Mini, also running 10.8.3.

Power on...
FileVault login...
wait... wait... wait... (don't have exact time)...
System auto-powers down...

I have to physically press the power button and restart then login if I wish the system to stay up.

Anyone else with this ever figure this out?

Thanks!

 

[rkaufmann87]

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?

You have 90 days of free AppleCare telephone support, no time like the present to begin using it.

 

[Serban]

So, any news? did you call Apple support? what is the verdict?

 

[justperry]

I did not try this out but I think it's a smart way to do this, why waste energy if you don't login, if this is build into OS X Apple made a good choice to do so.