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Modèle A1419 / Fin 2012 / Processeur 2.9 & 3.2 GHz Core i5 ou 3.4 GHz Core i7, ID iMac13,2

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Shuts Down Randomly When Inactive But Then Quietly Reboots Itself

It happens randomly daily. The Mac shuts itself down… so far only it only occurs when idle. The screen goes black. You don’t hear the chime or rebooting sounds associated with startup. When I slightly touch the power button as you would to wake the computer out of sleep… the grey start-up screen appears and begins to load the desktop. On the desktop a notification states that the computer shutdown unexpectedly with the option to either cancel or report the incident to apple. I have checked the consoles system.log immediately after shutdown to see if I can identify the cause for the failure.

The following is the Console System.Log’s notation:

Jan 31 21:19:29 localhost com.apple.xpc.launchd[1] (com.apple.opendirectoryd): Unknown key for Boolean: BeginTransactionAtShutdown

Jan 31 21:19:29 localhost com.apple.xpc.launchd[1] (org.cups.cupsd): Service has increased maximum shutdown time to 65 seconds. This will create a poor experience for the user.

Initially I thought it might be a partial power supply failure… but I wonder now if it isn’t a software matter. I have performed both an SMC and PRAM without success.

Would appreciate any knowledgeable input. Can supply any further information/screen captures that might help identify the problem.

Thank you for your time with this.

Alex

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You have a partially failing power supply. As it fails the frequency of the shutdowns will increase . In my case it got to where it was doing it four- five times a day. Initially I would just find that it had restarted during sleep at night, then it increased till I couldn’t work on it reliably.

Remplacement du bloc d'alimentation de l'iMac Intel 27" EMC 2546

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Thanks for your time and response. I agree that it is a very likely at the root of the problem… from all the online searches I have done… and is particularly associated with the late 2012 iMac. I’ve already identified on ifixit the appropriate replacement part. But, a the same time, I want to eliminate any possibility that it is a software or system file problem. From my research, there are two seemingly different characteristics that occur with my shutdown and reboot. It does not occur (so far) when the computer is active (being used by me) and the restart is silent…not accompanied by the traditional chime or mac rebooting sound.

par

To check if it is software related, boot up in Safe Mode by holding down the Shift key on start up. If the problem persists, it is hardware related.

par

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Alex Courtney sera éternellement reconnaissant.
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