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Jun 29, 2014 4:07 PM in response to diego.temocheby SEQLAR,Did you get a resolution ? My 1 month old iMac started to have the same issue. Shuts down randomly and I can't figure out why. I've noticed so far that it has done so when I'm not using it. For example I turned it on, work on it for few minutes and it works fine, I walk away for few minutes come back and it's off. And no it's not in standby mode it is completely off. Same thing happened to me few times already. I could be using it for few hours leave it and then when I come back minutes or hours after it's off. I'm getting the Previous Shutdown Cause: -128 code as well... I'm going to speak to apple support tonight and see what can they tell me about it.
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Jul 12, 2014 12:09 PM in response to diego.temocheby kd4ttc,See if your mac has dust clogging the air intakes. Vacuum clear if so and restart.
Steve