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Question: 27" iMac i5 Late 2012 shuts off w/o error message and requires SMC reset to turn on

macOS Sierra version 10.12.6

iMac (27-inch, Late 2012)

1TB Fusion Drive with

2.9 GHz Intel Core i5 processor and

8GB 1600 MHz DDR3 memory

NVIDIA GeForce GTX 660M 512 MB


I am essentially have the same issue as these other three threads linked below, all of which are closed to further comment, and it appears this problem hasn't been solved. Also found a some YT videos about it from this year (2018).

LATE 2012 27 inch IMAC Power Off Randomly

27 iMac (2012) crashes and requires smc reset to turn on

This one has 39 pages of comments detailing the same issue, and there is no consensus of a fix/repair that has actually worked or that the Apple Genius bar can even find. Sounds like I'm in for many trips to the Genius Bar and no way am I paying for logic boards etc when none of those cases worked.

Late 2012 (27") (i5) iMac - Keeps shutting down!


My issue:

My iMac will randomly shut down 3+ times per day. It has gradually gotten worse over the past 2+ years, and at least I am not running any graphics or editing programs. All four times it's happened today I was simply using Google Chrome browser to access gmail, calendars, trello, etc. It happened twice last night again using a Google Doc and Hangouts. It happens when others are using the computer to print labels or super basic tasks that should not be difficult for such an expensive iMac.


The only way to restart requires SMC reset, so I unplug the power cable from the back, wait a few minutes, plug it back in and hopefully the power button works, if not I repeat that process. I used to get error messages that would pop up after reboot with error codes etc. I don't think I still have any of them or screen shots, but I can look. I do remember looking up some of the error codes listed and it said something about kernel panics, but I haven't had one of those error messages for about a month now. It just shuts off to a black screen like it's lost power, and then requires SMC reset to turn back on.

I found a panic report from 02/16/2018, I'll put that below the EtreCheck one.


Things I've tried:

  • Run Apple Hardware Test as instructed from Apple Support (disconnecting everything and restarting while pressing D). This test said there were not hardware issues, but I've read in forums that this is detailed or reliable and that Genius Bar can do more, but still not find the issue.

    macOS Sierra: Use Apple Diagnostics or Apple Hardware Test

  • Tried to find the crash report using Console, but apparently this version of Sierra has known issues with Console not showing all those reports correctly. I tried searching system.log in Console with "shutdown cause" and got nothing. When searching just with "shutdown" it returned GoogleSoftwareUpdateDaemon shutdowns. I don't know if that is related but I can list those. Four of them listed (in bold) coincide with the random shutdowns today and last night but not the rest.
  • Mar 15 02:11:37 QueenB GoogleSoftwareUpdateDaemon[2438]: 2018-03-15 02:11:37.090 GoogleSoftwareUpdateDaemon[2438/0x7fff9546f3c0] [lvl=2] -[KeystoneDaemon main] GoogleSoftwareUpdateDaemon inactive, shutdown.

  • Mar 15 07:13:39 QueenB GoogleSoftwareUpdateDaemon[2678]: 2018-03-15 07:13:39.817 GoogleSoftwareUpdateDaemon[2678/0x7fff9546f3c0] [lvl=2] -[KeystoneDaemon main] GoogleSoftwareUpdateDaemon inactive, shutdown.

  • Mar 15 12:15:38 QueenB GoogleSoftwareUpdateDaemon[3056]: 2018-03-15 12:15:38.186 GoogleSoftwareUpdateDaemon[3056/0x7fff9546f3c0] [lvl=2] -[KeystoneDaemon main] GoogleSoftwareUpdateDaemon inactive, shutdown.

  • Mar 15 17:17:36 QueenB GoogleSoftwareUpdateDaemon[3221]: 2018-03-15 17:17:36.241 GoogleSoftwareUpdateDaemon[3221/0x7fff9546f3c0] [lvl=2] -[KeystoneDaemon main] GoogleSoftwareUpdateDaemon inactive, shutdown.

  • Mar 15 22:21:34 QueenB GoogleSoftwareUpdateDaemon[3503]: 2018-03-15 22:21:34.433 GoogleSoftwareUpdateDaemon[3503/0x7fff9546f3c0] [lvl=2] -[KeystoneDaemon main] GoogleSoftwareUpdateDaemon inactive, shutdown.

  • Mar 16 11:15:45 QueenB GoogleSoftwareUpdateDaemon[486]: 2018-03-16 11:15:45.971 GoogleSoftwareUpdateDaemon[486/0x7fffb9b793c0] [lvl=2] -[KeystoneDaemon main] GoogleSoftwareUpdateDaemon inactive, shutdown.

  • Mar 16 13:20:23 QueenB shutdown[762]: SHUTDOWN_TIME: 1521224423 903828

  • Mar 16 16:26:10 QueenB GoogleSoftwareUpdateDaemon[434]: 2018-03-16 16:26:10.442 GoogleSoftwareUpdateDaemon[434/0x7fffc650c3c0] [lvl=2] -[KeystoneDaemon main] GoogleSoftwareUpdateDaemon inactive, shutdown.

  • I deleted unused or faulty apps manually. I deleted Clean My Mac 2 and 3 that someone else downloaded to my iMac. I deleted any third party apps I was unfamiliar with. I don't know how to check all plug-ins and delete those.

  • I began the process listed here macOS Sierra: If your Mac restarts and a message appears. I currently am in Safe Mode (macOS Sierra: Start up in safe mode). I opened app store and updated apps like article says. It's been about 2.5 hours without shutdown in SafeMode. I don't if that will last until I can get this figured out.

  • I downloaded EtreCheck in Safe Mode and generated a report. I will attach that below.

  • Searched system.log using Console with "crash" and found quite a few .ReportCrash listings starting from about 20mins before shut down until now. There have been several of these reports during the time I've been in Safe Mode, but no shut down yet.
  • Mar 15 21:57:42 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash.Root[3448]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash.DirectoryService

  • Mar 15 23:30:16 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[3880]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 11:15:11 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash): The DrainMessagesOnCrash key is not yet implemented. If you rely on this key, please file a bug.

  • Mar 16 11:15:11 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash.Self): The DrainMessagesOnCrash key is not yet implemented. If you rely on this key, please file a bug.

  • Mar 16 11:15:16 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[494]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 11:17:10 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[736]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 12:15:57 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[1087]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 12:35:56 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash): The DrainMessagesOnCrash key is not yet implemented. If you rely on this key, please file a bug.

  • Mar 16 12:35:56 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash.Self): The DrainMessagesOnCrash key is not yet implemented. If you rely on this key, please file a bug.

  • Mar 16 12:36:03 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[440]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 13:14:46 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash): The DrainMessagesOnCrash key is not yet implemented. If you rely on this key, please file a bug.

  • Mar 16 13:14:46 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash.Self): The DrainMessagesOnCrash key is not yet implemented. If you rely on this key, please file a bug.

  • Mar 16 13:14:56 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[449]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 13:49:38 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash): The DrainMessagesOnCrash key is not yet implemented. If you rely on this key, please file a bug.

  • Mar 16 13:49:38 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash.Self): The DrainMessagesOnCrash key is not yet implemented. If you rely on this key, please file a bug.

  • Mar 16 13:49:48 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[453]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 14:09:09 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[891]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 14:22:30 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[1281]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 14:34:22 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[1764]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 15:23:21 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash): The DrainMessagesOnCrash key is not yet implemented. If you rely on this key, please file a bug.

  • Mar 16 15:23:21 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash.Self): The DrainMessagesOnCrash key is not yet implemented. If you rely on this key, please file a bug.

  • Mar 16 15:23:31 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[454]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 16:25:34 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash): The DrainMessagesOnCrash key is not yet implemented. If you rely on this key, please file a bug.

  • Mar 16 16:25:34 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash.Self): The DrainMessagesOnCrash key is not yet implemented. If you rely on this key, please file a bug.

  • Mar 16 16:25:42 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[454]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 16:52:33 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash.Root[260]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash.DirectoryService

  • Mar 16 16:53:05 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash): The DrainMessagesOnCrash key is not yet implemented. If you rely on this key, please file a bug.

  • Mar 16 16:53:05 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash.Self): The DrainMessagesOnCrash key is not yet implemented. If you rely on this key, please file a bug.

  • Mar 16 16:53:13 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[445]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 16:55:25 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash.Root[579]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash.DirectoryService

  • Mar 16 16:56:22 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[605]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 16:57:57 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[672]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 17:02:58 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[788]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 18:05:55 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[5898]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 18:57:29 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[6638]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Mar 16 19:41:41 QueenB com.apple.xpc.launchd[1] (com.apple.ReportCrash[7229]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash

  • Next steps will be to delete and possible re-download and install apps like browsers etc, if I can do that in Safe Mode. I'm wondering if that Google Software Update Daemon might be the issues as shown above. I use Google Chrome as my primary browser and I'm sure there are lots of extensions etc added on to it.



EtreCheck version: 4.1.3 (4A188)

Report generated: 2018-03-16 17:11:24

Download EtreCheck from https://etrecheck.com

Runtime: 6:12

Performance: Below Average


Problem: Computer is restarting

Description:

Mac continually shutting off without warning or kernel panic popup (much like when power is lost), and takes a few minutes rest before it will start back up. Ran hardware diagnostics that came up normal.


Major Issues: None


Minor Issues:

These issues do not need immediate attention but they may indicate future problems.


Low disk space - This machine is running low on free hard drive space.

Unsigned files - There is unsigned software installed. They appear to be legitimate but should be reviewed.

Low performance - EtreCheck report took over 5 minutes to run. This is unusual.


Hardware Information:

iMac (27-inch, Late 2012)

iMac Model: iMac13,2

1 2.9 GHz Intel Core i5 (i5-3470S) CPU: 4-core

8 GB RAM Upgradeable

BANK 0/DIMM0

4 GB DDR3 1600 ok

BANK 1/DIMM0

4 GB DDR3 1600 ok

BANK 0/DIMM1

Empty

BANK 1/DIMM1

Empty


Video Information:

NVIDIA GeForce GTX 660M - VRAM: 512 MB

iMac 2560 x 1440


Drives:

disk0 - APPLE SSD SM128E 121.33 GB (Solid State - TRIM: Yes)

Internal SATA 6 Gigabit Serial ATA

disk0s1 - EFI (MS-DOS FAT32) [EFI] 210 MB

disk0s2 [Core Storage Container] 120.99 GB

disk2 - Macintosh HD (Journaled HFS+) [Fusion Drive] 1.11 TB

disk0s3 - B*******X (Journaled HFS+) [Recovery] 134 MB


disk1 - APPLE HDD ST1000DM003 1.00 TB (Mechanical)

Internal SATA 3 Gigabit Serial ATA

disk1s1 - EFI (MS-DOS FAT32) [EFI] 210 MB

disk1s2 [Core Storage Container] 999.35 GB

disk2 - Macintosh HD (Journaled HFS+) [Fusion Drive] 1.11 TB

disk1s3 - Recovery HD (Journaled HFS+) [Recovery] 650 MB


Mounted Volumes:

disk2 - Macintosh HD [Fusion Drive] 1.11 TB (14.28 GB free)

Journaled HFS+

Mount point: /


Network:

Interface en0: Ethernet

Interface en5: iPhone

Interface en1: Wi-Fi 2

802.11 a/b/g/n

One IPv4 address

Interface en4: Bluetooth PAN

Interface bridge0: Thunderbolt Bridge

Interface bridge0: Thunderbolt Bridge 2

iCloud Quota: 72.96 GB available

iCloud Status: one pending file


System Software:

macOS Sierra 10.12.6 (16G1212)

Time since boot: Less than an hour

System Load: 2.65 (1 min ago) 3.85 (5 min ago) 3.84 (15 min ago)


Security:

System Status

Gatekeeper Mac App Store and identified developers

System Integrity Protection Enabled


Unsigned Files:

Launchd: /Library/LaunchDaemons/com.microsoft.office.licensing.helper.plist

Executable: /Library/PrivilegedHelperTools/com.microsoft.office.licensing.helper

Details: Exact match found in the whitelist - probably OK


System Launch Agents:

[Not Loaded] 6 Apple tasks

[Loaded] 182 Apple tasks

[Running] 97 Apple tasks


System Launch Daemons:

[Not Loaded] 36 Apple tasks

[Loaded] 179 Apple tasks

[Running] 102 Apple tasks

[Other] 4 Apple tasks


Launch Agents:

[Not Loaded] com.google.keystone.agent.plist (Google, Inc. - installed 2018-02-03)


Launch Daemons:

[Not Loaded] com.microsoft.autoupdate.helper.plist (Microsoft Corporation - installed 2017-05-01)

[Not Loaded] com.adobe.fpsaud.plist (Adobe Systems, Inc. - installed 2018-02-23)

[Not Loaded] com.microsoft.office.licensing.helper.plist (? 6d8cb30e - installed 2013-03-08)

[Not Loaded] com.apple.installer.cleanupinstaller.plist (Apple, Inc. - installed 2017-05-01)

[Not Loaded] com.google.keystone.daemon.plist (Google, Inc. - installed 2018-03-05)

[Not Loaded] com.microsoft.office.licensingV2.helper.plist (Microsoft Corporation - installed 2017-04-09)


User Launch Agents:

[Not Loaded] com.dropbox.DropboxMacUpdate.agent.plist (Dropbox, Inc. - installed 2017-08-10)


User Login Items:

iTunesHelper Application (Apple, Inc. - installed 2018-01-25)

(/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

Dropbox Application (Dropbox, Inc.

(/Applications/Dropbox.app)

CrossOver CD Helper Application

(/Applications/CrossOver.app/Contents/Resources/CrossOver CD Helper.app)

OneDrive Application (Mac App Store

(/Applications/OneDrive.app)

Google Chrome Application (Google, Inc.

(/Applications/Google Chrome.app)


Internet Plug-ins:

FlashPlayer-10.6: 29.0.0.113 (installed 2018-03-13)

QuickTime Plugin: 7.7.3 (installed 2018-02-26)

Flash Player: 29.0.0.113 (installed 2018-03-13)

o1dbrowserplugin: 5.41.3.0 (installed 2016-04-30)

SharePointBrowserPlugin: 14.4.7 (installed 2015-01-12)

googletalkbrowserplugin: 5.41.3.0 (installed 2015-12-11)

Silverlight: 5.1.30514.0 (installed 2015-03-05)

MeetingJoinPlugin: Unknown (installed 2014-06-22)


Safari Extensions:

Add To Amazon Wish List.safariextz - Amazon.com - https://www.amazon.com/wishlist?ref=cm_wl_saf_ext (installed 2013-01-18)


3rd Party Preference Panes:

Flash Player (installed 2018-02-23)


Time Machine:

Skip System Files: No

Mobile backups:

Auto backup: Yes

Volumes being backed up:

Macintosh HD: Disk size: 1.11 TB - Disk used: 1.10 TB

Destinations:

M*****************c [Local] (Last used)

Total size: 2.00 TB

Total number of backups: 78

Oldest backup: 2015-01-06 09:40:58

Last backup: 2017-05-01 05:21:19


Top Processes by CPU:

Process (count) Source % of CPU

storedownloadd Apple 32

kernel_task Apple 11

WindowServer Apple 7

dpd (2) Apple 4

com.apple.WebKit.WebContent Apple 3


Top Processes by Memory:

Process (count) Source RAM usage

kernel_task Apple 765 MB

Safari Apple 199 MB

assistant_service Apple 181 MB

com.apple.WebKit.WebContent Apple 169 MB

com.apple.CommerceKit.TransactionService (4) Apple 161 MB


Top Processes by Network Use:

Process Source Input Output

nsurlsessiond Apple 18 KB 63 MB

mDNSResponder Apple 78 KB 64 KB

apsd Apple 14 KB 22 KB

netbiosd Apple 3 KB 2 KB


Top Processes by Energy Use:

Process (count) Source Energy usage (0-100)

WindowServer Apple 2

hidd Apple 0

cloudd Apple 0

launchd Apple 0

syncdefaultsd Apple 0


Virtual Memory Information:

Available RAM 1.44 GB

Free RAM 41 MB

Used RAM 6.56 GB

Cached files 1.40 GB

Swap Used 37 MB


Software Installs (past 30 days):

Name Version Install Date

OneDrive 17.005.0107 2018-03-16

Evernote 7.0.2 2018-03-16

Bible Study 6.0.14 2018-03-16

Kindle 1.21.1 2018-03-16


Diagnostics Information (past 7 days):

2018-03-16 16:51:10 Last Shutdown Cause: 0 - Power loss (once)

2018-03-16 14:34:41 Skype.app Crash (once)

objc_msgSend() selector name: alloc

2018-03-11 12:07:37 QuickTime Player.app Hang (once)

2018-02-16 10:33:44 Kernel Kernel Panic (once)

3rd Party Kernel Extensions: None


End of report

Kernel Panic Report

Anonymous UUID: B63494CA-641A-22CF-C119-AF99CE930D79



Fri Feb 16 10:33:43 2018



*** Panic Report ***

panic(cpu 0 caller 0xffffff800ef6b46f): initproc exited -- exit reason namespace 2 subcode 0xa description: none



Thread 3 crashed



RAX: 0x000000010406f000, RBX: 0x00007fffa9595108, RCX: 0x00007fffa9595108, RDX: 0x000000010fcfa978

RSP: 0x00007000047c1b70, RBP: 0x00007000047c1b70, RSI: 0x00000000000016f7, RDI: 0x000000010fcfdb18

R8: 0x00007fffa9595139, R9: 0x00007000047c1f80, R10: 0x0000000004001080, R11: 0x00000001040b3188

R12: 0x000000010fcfdb18, R13: 0x00007ffd0800b800, R14: 0x00000000000016f7, R15: 0x000000010fcfa978

RFL: 0x0000000000010202, RIP: 0x000000010fccefd4, CS: 0x000000000000002b, SS: 0x0000000000000023



Thread 0: 0xffffff802360ce18

0x00007fffa96c0386

Could not read LR from frame at 0x00007000045b6ca8



Thread 1: 0xffffff802360c4e8

0x00007fffa96c81e6

0x00007fffa957124f

0x0000000000000000



Thread 2: 0xffffff802b268b90

0x00007fffa96c96ae

0x00007fffa9578a16

0x00007fffa956ea6c

0x00007fffa956613b

0x00007fffa95797db

0x00007fffa956c306

0x00007fffa95656b5

0x00007fffa956548c

0x00007fffa97b25a2

0x00007fffa97b207d

0x0000000000000000



Thread 3: 0xffffff802eb494c0

0x000000010fccefd4

0x000000010fcd7f8b

0x000000010fcbf86d

0x00007fffa9595282

0x00000001040b3188

0x000000010408349b

0x0000000104082da0

0x0000000104086073

0x00007fffa95638fc

0x00007fffa9578a16

0x00007fffa956ea6c

0x00007fffa956613b

0x00007fffa95797db

0x00007fffa956c306

0x00007fffa957a24c

0x00007fffa957d27a

0x00007fffa97b247b

0x00007fffa97b207d

0x0000000000000000



Thread 4: 0xffffff8029ed0078

0x00007fffa97b2070



Thread 5: 0xffffff8029eca498

0x00007fffa97b2070





Mac OS version:

16G29



Kernel version:

Darwin Kernel Version 16.7.0: Thu Jun 15 17:36:27 PDT 2017; root:xnu-3789.70.16~2/RELEASE_X86_64

Kernel UUID: D3314D98-5D40-3CD8-98A4-F1DD46C20E03

System model name: iMac13,2 (Mac-FC02E91DDD3FA6A4)

Root disk errors: "Could not recover SATA HDD after 5 attempts. Terminating."



System Profile:

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xF4), Broadcom BCM43xx 1.0 (7.21.171.133.1a2)

Bluetooth: Version 5.0.5f1, 3 services, 27 devices, 1 incoming serial ports

Thunderbolt Bus: iMac, Apple Inc., 23.4

Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54333531533643465238432D50422020

Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54333531533643465238432D50422020

USB Device: USB 2.0 Bus

USB Device: Hub

USB Device: FaceTime HD Camera (Built-in)

USB Device: USB 2.0 Bus

USB Device: Hub

USB Device: Hub

USB Device: BRCM20702 Hub

USB Device: Bluetooth USB Host Controller

USB Device: USB 3.0 Bus

USB Device: HP LaserJet P2055

Serial ATA Device: APPLE HDD ST1000DM003, 1 TB

Serial ATA Device: APPLE SSD SM128E, 121.33 GB

Model: iMac13,2, BootROM IM131.010F.B00, 4 processors, Intel Core i5, 2.9 GHz, 8 GB, SMC 2.11f14

Network Service: Wi-Fi 2, AirPort, en1

Graphics: NVIDIA GeForce GTX 660M, NVIDIA GeForce GTX 660M, PCIe, 512 MB

iMac, macOS Sierra (10.12.6), 27 in Late 2012 i5 1TB fusion 8GB

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Question: 27" iMac i5 Late 2012 shuts off w/o error message and requires SMC reset to turn on