iMac late 2012 random shutdowns + etre report

Hi all.

I've searched the forums for advice on this one and not pinned down anything obvious to my own situation. My computer is shutting down at (seemingly) completely random points. Sometimes it can go several hours, sometimes it will shut down again before I can even log on. I have to unplug the power cord and wait a few minutes before powering back on for it to work at all.

I've tried, to my knowledge, the SMC and PRAM recommendations without any improvement.

One thing I did find was advice on running an etre report which I have included below. I am I right in thinking the end of this report indicates a PSU issue?

Appreciate any advice received.

EtreCheck version: 3.4.6 (460)

Report generated 2017-11-30 09:35:38

Download EtreCheck from https://etrecheck.com

Runtime: 2:13

Performance: Excellent

Click the [Lookup] links for more information from Apple Support Communities.

Click the [Details] links for more information about that line.

Click the [Clean up] link to delete unused files.

Problem: Other problem

Description:

random shutdowns

Hardware Information:ⓘ

iMac (27-inch, Late 2012)

[Technical Specifications] - [User Guide] - [Warranty & Service]

iMac - model: iMac13,2

1 3.4 GHz Intel Core i7 (i7-3770) CPU: 4-core

24 GB RAM Upgradeable - [Instructions]

BANK 0/DIMM0

8 GB DDR3 1600 MHz ok

BANK 1/DIMM0

4 GB DDR3 1600 MHz ok

BANK 0/DIMM1

8 GB DDR3 1600 MHz ok

BANK 1/DIMM1

4 GB DDR3 1600 MHz ok

Handoff/Airdrop2: supported

Wireless: en1: 802.11 a/b/g/n

iCloud Quota: 185 MB available (Low!)

Video Information:ⓘ

NVIDIA GeForce GTX 680MX - VRAM: 2 GB

iMac 2560 x 1440

Disk Information:ⓘ

APPLE HDD ST3000DM001 disk0: (3 TB) (Rotational)

[Show SMART report]

EFI (disk0s1 - MS-DOS FAT32) <not mounted> [EFI]: 210 MB

Macintosh HD (disk0s2 - Journaled HFS+) / [Startup]: 3.00 TB (2.23 TB free)

Recovery HD (disk0s3 - HFS+) <not mounted> [Recovery]: 650 MB

USB Information:ⓘ

USB20Bus

hub_device

Apple Inc. FaceTime HD Camera (Built-in)

USB20Bus

hub_device

hub_device

Apple Inc. BRCM20702 Hub

Apple Inc. Bluetooth USB Host Controller

USB30Bus

SIGMACHIP USB Keyboard

Thunderbolt Information:ⓘ

Apple Inc. thunderbolt_bus

System Software:ⓘ

macOS High Sierra 10.13 (17A405) - Time since boot: about 11 hours

Gatekeeper:ⓘ

Mac App Store and identified developers

Clean up:ⓘ

/Library/LaunchDaemons/com.fujifilm.importer.plist

./PCAutoSaveSv

Executable not found!

/Library/LaunchDaemons/com.nvidia.cuda.launcher.plist

/Library/PreferencePanes/CUDA Preferences.prefPane/Contents/Resources/CUDAd.sh start

Executable not found!

2 orphan files found. [Clean up]

Kernel Extensions:ⓘ

/Library/Extensions

[loaded] com.Cycling74.driver.Soundflower (2.0b2 - SDK 10.10) [Lookup]

[loaded] com.globaldelight.driver.Boom2Device (1.2 - SDK 10.10) [Lookup]

[not loaded] com.nvidia.CUDA (1.1.0) [Lookup]

System Launch Agents:ⓘ

[not loaded] 8 Apple tasks

[loaded] 160 Apple tasks

[running] 120 Apple tasks

System Launch Daemons:ⓘ

[not loaded] 37 Apple tasks

[loaded] 178 Apple tasks

[running] 115 Apple tasks

Launch Agents:ⓘ

[not loaded] com.adobe.AAM.Updater-1.0.plist (Adobe Systems, Inc. - installed 2016-05-15) [Lookup]

[failed] com.adobe.ARMDCHelper.cc24aef4a1b90ed56a725c38014c95072f92651fb65e1bf9c8e43c37a2 3d420d.plist (Adobe Systems, Inc. - installed 2017-01-11) [Lookup]

[running] com.adobe.AdobeCreativeCloud.plist (Adobe Systems, Inc. - installed 2016-05-15) [Lookup]

[loaded] com.google.keystone.agent.plist (Google, Inc. - installed 2017-10-03) [Lookup]

[failed] com.nvidia.CUDASoftwareUpdate.plist (NVIDIA Corporation - installed 2017-10-19) [Lookup]

[running] com.rosettastone.rosettastonedaemon.plist (Rosetta Stone Ltd. - installed 2016-04-25) [Lookup]

Launch Daemons:ⓘ

[loaded] com.adobe.ARMDC.Communicator.plist (Adobe Systems, Inc. - installed 2017-01-11) [Lookup]

[loaded] com.adobe.ARMDC.SMJobBlessHelper.plist (Adobe Systems, Inc. - installed 2017-01-11) [Lookup]

[loaded] com.adobe.SwitchBoard.plist (? 68cad67 0 - installed 2015-06-24) [Lookup]

[running] com.adobe.agsservice.plist (Adobe Systems, Inc. - installed 2017-09-28) [Lookup]

[loaded] com.adobe.fpsaud.plist (? 2afb3af7 defea098 - installed 2017-10-26) [Lookup]

[not loaded] com.apple.installer.cleanupinstaller.plist (? 1963bf56 0 - installed 2017-10-16)

[running] com.fujifilm.importer.plist (? 80994af4 0 - installed 2013-03-01) [Lookup] - ./PCAutoSaveSv: Executable not found!

[loaded] com.google.keystone.daemon.plist (Google, Inc. - installed 2017-10-13) [Lookup]

[loaded] com.microsoft.office.licensing.helper.plist (? 6d8cb30e d69ec25d - installed 2014-05-09) [Lookup]

[failed] com.nvidia.cuda.launcher.plist (? 20f73770 0 - installed 2017-10-19) [Lookup] - /Library/PreferencePanes/CUDA Preferences.prefPane/Contents/Resources/CUDAd.sh: Executable not found!

[loaded] com.nvidia.cudad.plist (NVIDIA Corporation - installed 2017-10-19) [Lookup]

[loaded] com.skype.skypeinstaller.plist (Skype - installed 2016-01-18) [Lookup]

User Launch Agents:ⓘ

[loaded] com.adobe.AAM.Updater-1.0.plist (Adobe Systems, Inc. - installed 2016-05-15) [Lookup]

[running] com.amazon.music.plist (? 7c73c27a c3e726df - installed 2016-12-15) [Lookup]

[loaded] com.cisco.videoguard7.plist (Shell Script c8b7826e - installed 2017-10-03)

[loaded] com.cisco.videoguard7.uninstall.plist (Shell Script 77aaabed - installed 2017-10-03)

[running] com.cisco.videoguardmonitor.plist (Shell Script 2864b4de - installed 2017-10-03)

[loaded] com.citrixonline.GoToMeeting.G2MUpdate.plist (Citrix Online LLC - installed 2017-05-25) [Lookup]

[loaded] com.dropbox.DropboxMacUpdate.agent.plist (Dropbox, Inc. - installed 2017-08-11) [Lookup]

[loaded] com.skype.skype.shareagent.plist (Skype Communications S.a.r.l - installed 2017-11-29) [Lookup]

[running] com.spotify.webhelper.plist (Spotify - installed 2017-10-19) [Lookup]

[loaded] com.valvesoftware.steamclean.plist (? 6bea29e7 6db598b5 - installed 2017-11-26) [Lookup]

User Login Items:ⓘ

Macs Fan Control 3 Application

(~/Applications/Macs Fan Control 3.app)

Boom Helper SMLoginItem - Hidden (Global Delight Technologies Pvt. Ltd - installed 2017-11-09)

(/Applications/Boom 3D.app/Contents/Library/LoginItems/BoomHelper.app)

MemoryCleanHelper SMLoginItem - Hidden (Apple, Inc. - installed 2017-07-12)

(/Applications/Memory Clean.app/Contents/Library/LoginItems/MemoryCleanHelper.app)

1Password Helper URL SMLoginItem - Hidden (Apple, Inc. - installed 2015-04-08)

(/Applications/1Password.app/Contents/Library/LoginItems/2BUA8C4S2C.com.agilebi ts.onepassword-osx-helper.app)

com.adobe.SwitchBoard.monitor.plist MachInit - Hidden

(/etc/mach_init_per_user.d/com.adobe.SwitchBoard.monitor.plist)

Mach Init items are deprecated

Internet Plug-ins:ⓘ

AdobeAAMDetect: 3.0.0.0 (installed 2016-05-15) [Lookup]

FlashPlayer-10.6: 27.0.0.187 (installed 2017-11-14) [Lookup]

QuickTime Plugin: 7.7.3 (installed 2017-10-03)

AdobePDFViewerNPAPI: 17.012.20098 (installed 2017-11-16) [Lookup]

AdobePDFViewer: 18.009.20044 (installed 2017-11-16) [Lookup]

Flash Player: 27.0.0.187 (installed 2017-11-14) [Lookup]

SharePointBrowserPlugin: 14.4.2 (installed 2015-05-06) [Lookup]

Silverlight: 5.1.50901.0 (installed 2017-08-26) [Lookup]

MeetingJoinPlugin: Unknown (installed 2015-05-06) [Lookup]

User internet Plug-ins:ⓘ

CitrixOnlineWebDeploymentPlugin: 1.0.105 (installed 2013-04-26) [Lookup]

Safari Extensions:ⓘ

[enabled] 1Password - AgileBits - https://agilebits.com/onepassword (installed 2017-11-07)

3rd Party Preference Panes:ⓘ

Flash Player (installed 2017-10-26) [Lookup]

Time Machine:ⓘ

Skip System Files: NO

Auto backup: YES

Volumes being backed up:

Macintosh HD: Disk size: 3.00 TB Disk used: 769.60 GB

Destinations:

Data [Network]

Total size: 2.00 TB

Total number of backups: 77

Oldest backup: 24/03/2017, 11:46

Last backup: 30/11/2017, 09:19

Size of backup disk: Too small

Backup size 2.00 TB < (Disk used 769.60 GB X 3)

Top Processes by CPU:ⓘ

6% WindowServer

3% kernel_task

1% coreaudiod

1% Google Chrome Helper

1% mds

Top Processes by Memory:ⓘ

1.45 GB kernel_task

649 MB softwareupdated

485 MB Google Chrome Helper

355 MB com.apple.WebKit.WebContent

337 MB mds_stores

Top Processes by Network Use:ⓘ

Input Output Process name

102 KB 45 KB mDNSResponder

30 KB 41 KB Skype

9 KB 7 KB apsd

7 KB 2 KB cloudd

2 KB 1 KB netbiosd

Top Processes by Energy Use:ⓘ

8.20 WindowServer

4.16 coreaudiod

2.96 Creative Cloud

0.98 Google Chrome Helper

Virtual Memory Information:ⓘ

14.43 GB Available RAM

7.05 GB Free RAM

9.57 GB Used RAM

7.38 GB Cached files

0 B Swap Used

Software installs (last 30 days):ⓘ

CUDA 9.0: (installed 2017-11-02)

Affinity Photo: 1.6.6 (installed 2017-11-05)

Adobe Flash Player: (installed 2017-11-14)

Adobe Acrobat Reader DC (18.009.20044): (installed 2017-11-16)

Install information may not be complete.

Diagnostics Events (last 3 days for minor events):ⓘ

2017-11-29 22:18:14 Last shutdown cause: 0 - Power loss

2017-11-29 19:39:21 CCXProcess.app Crash [Open]