Q: iMac late 2012 edition crashes on restart after installing Sierra

Well, I've already initiated the Restore process, so I'll have to wait until that finishes. Meanwhile I'll look at the link you supplied for staring up in safe mode. It's been a while since I've done that, so I don't remember the procedure.

Thanks

Below is the report. It looks like some issue with an old Wacom tablet might have caused the crash during set up, but I thought I'd uninstalled that tablet years ago along with any related software. I probably used Wacom's uninstall application to do that. Anyway, I'd appreciate your help with this.

EtreCheck version: 3.0.5 (309)

Report generated 2016-09-27 09:36:35

Download EtreCheck from https://etrecheck.com

Runtime 3:04

Performance: Good

Click the [Support] links for help with non-Apple products.

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

Problem: Other problem

Description:

Computer crashing during the start up process after restart.

Hardware Information: ⓘ

    iMac (21.5-inch, Late 2012)

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

    iMac - model: iMac13,1

    1 3.1 GHz Intel Core i7 CPU: 4-core

    16 GB RAM Upgradeable - [Instructions]

        BANK 0/DIMM0

            8 GB DDR3 1600 MHz ok

        BANK 1/DIMM0

            8 GB DDR3 1600 MHz ok

    Bluetooth: Good - Handoff/Airdrop2 supported

    Wireless:  en1: 802.11 a/b/g/n

Video Information: ⓘ

    NVIDIA GeForce GT 650M - VRAM: 512 MB

        iMac 1920 x 1080

System Software: ⓘ

    macOS Sierra  10.12 (16A323) - Time since boot: less than an hour

Disk Information: ⓘ

    APPLE HDD HTS541010A9E662 disk0 : (1 TB) (Rotational)

        EFI (disk0s1) <not mounted> : 210 MB

        Macintosh HD (disk0s2) / : 999.35 GB (733.23 GB free)

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

    ST2000DM001-1CH164 disk2 : (2 TB) (Rotational)

        EFI (disk2s1) <not mounted> : 210 MB

        disk2s2 (disk2s2) <not mounted> : 2.00 TB

        Boot OS X (disk2s3) <not mounted> : 134 MB

    ST2000DM001-1CH164 disk1 : (2 TB) (Rotational)

        EFI (disk1s1) <not mounted> : 210 MB

        disk1s2 (disk1s2) <not mounted> : 2.00 TB

        Boot OS X (disk1s3) <not mounted> : 134 MB

    ST2000DM001-1CH164 disk3 : (2 TB) (Rotational)

        EFI (disk3s1) <not mounted> : 210 MB

        disk3s2 (disk3s2) <not mounted> : 2.00 TB

        Boot OS X (disk3s3) <not mounted> : 134 MB

    ST2000DM001-1CH164 disk5 : (2 TB) (Rotational)

        EFI (disk5s1) <not mounted> : 210 MB

        iMac Backups (disk5s2) /Volumes/iMac Backups : 2.00 TB (1.53 TB free)

    ST2000DM001-1CH164 disk6 : (2 TB) (Rotational)

        EFI (disk6s1) <not mounted> : 210 MB

        disk6s2 (disk6s2) <not mounted> : 2.00 TB

        Boot OS X (disk6s3) <not mounted> : 134 MB

USB Information: ⓘ

    Generic Mass Storage Device

    Apple Inc. Apple Watch Magnetic Charging Cable

    Apple Inc. FaceTime HD Camera (Built-in)

    Apple Inc. BRCM20702 Hub

        Apple Inc. Bluetooth USB Host Controller

    Apple, Inc. Keyboard Hub

        Apple, Inc Apple Keyboard

Thunderbolt Information: ⓘ

    Apple Inc. thunderbolt_bus

        LaCie 5big SR

Configuration files: ⓘ

    /etc/sudoers, File size 2299 but expected 1563

Gatekeeper: ⓘ

    Mac App Store and identified developers

Kernel Extensions: ⓘ

        /Library/Application Support/MacKeeper/AntiVirus.app

    [not loaded]    net.kromtech.kext.AVKauth (2.3.9 - SDK 10.10 - 2015-08-17) [Support]

    [not loaded]    net.kromtech.kext.Firewall (2.3.9 - SDK 10.10 - 2015-08-17) [Support]

        /System/Library/Extensions

    [not loaded]    com.SiliconImage.driver.Si3132r5 (1.7.5 - 2016-09-26) [Support]

    [not loaded]    com.fklt.driver.cdu680 (1.0 - 2016-09-26) [Support]

    [not loaded]    com.olympus.CamBlockCommandsDevice (2.0.0 - 2016-09-26) [Support]

    [not loaded]    com.olympus.CamBlockCommandsDeviceUP (3.1.0 - SDK 10.6 - 2016-09-26) [Support]

    [not loaded]    com.wacom.kext.wacomtablet (Wacom Tablet 6.0.5-2 - 2016-09-26) [Support]

        /System/Library/Extensions/OlympusDSCDriver.kext/Contents/PlugIns

    [not loaded]    com.olympus.CamFWSerialBusProtocolTransport (2.0.0 - 2006-11-30) [Support]

    [not loaded]    com.olympus.CamUSBMassStorageClass (2.0.0 - 2006-11-30) [Support]

Startup Items: ⓘ

    HP Trap Monitor: Path: /Library/StartupItems/HP Trap Monitor

    SATARaid5Daemon: Path: /Library/StartupItems/SATARaid5Daemon

    Startup items are obsolete in OS X Yosemite

System Launch Agents: ⓘ

    [not loaded]    8 Apple tasks

    [loaded]    163 Apple tasks

    [running]    100 Apple tasks

System Launch Daemons: ⓘ

    [not loaded]    com.apple.jetsamproperties.Mac.plist (2016-08-25) [Support]

    [not loaded]    38 Apple tasks

    [loaded]    165 Apple tasks

    [running]    101 Apple tasks

Launch Agents: ⓘ

    [not loaded]    com.adobe.AAM.Updater-1.0.plist (2010-07-11) [Support]

    [failed]    com.adobe.ARMDCHelper.cc24aef4a1b90ed56a725c38014c95072f92651fb65e1bf9c8e43c37a2 3d420d.plist (2016-07-12) [Support]

    [loaded]    com.adobe.CS4ServiceManager.plist (2008-12-30) [Support]

    [loaded]    com.adobe.CS5ServiceManager.plist (2010-07-11) [Support]

    [running]    com.epson.Epson_Low_Ink_Reminder.launcher.plist (2015-01-19) [Support]

    [loaded]    com.epson.esua.launcher.plist (2016-07-27) [Support]

    [running]    com.epson.eventmanager.agent.plist (2014-09-21) [Support]

    [loaded]    com.epson.scannermonitor.plist (2015-12-16) [Support]

    [loaded]    com.google.keystone.agent.plist (2016-07-11) [Support]

    [running]    com.lacie.raidmonitor.daemon.plist (2012-12-28) [Support]

    [running]    com.wacom.wacomtablet.plist (2007-08-28) [Support]

Launch Daemons: ⓘ

    [loaded]    com.adobe.ARMDC.Communicator.plist (2016-07-12) [Support]

    [loaded]    com.adobe.ARMDC.SMJobBlessHelper.plist (2016-07-12) [Support]

    [loaded]    com.adobe.SwitchBoard.plist (2010-07-11) [Support]

    [loaded]    com.adobe.fpsaud.plist (2016-08-29) [Support]

    [loaded]    com.google.keystone.daemon.plist (2016-08-31) [Support]

    [loaded]    com.microsoft.office.licensing.helper.plist (2014-11-17) [Support]

    [loaded]    com.microsoft.office.licensingV2.helper.plist (2015-07-01) [Support]

    [loaded]    com.regularrateandrhythm.rowmotehelperaide.plist (2014-07-10) [Support]

    [running]    com.zeobit.MacKeeper.AntiVirus.plist (2011-11-24) [Support]

    [running]    com.zeobit.MacKeeper.plugin.AntiTheft.daemon.plist (2011-11-24) [Support]

User Launch Agents: ⓘ

    [loaded]    com.adobe.AAM.Updater-1.0.plist (2010-07-12) [Support]

    [failed]    com.adobe.ARM.[...].plist (2015-01-26) [Support]

    [failed]    com.apple.SafariBookmarksSyncer.plist (2009-08-06)

    [loaded]    com.citrixonline.GoToMeeting.G2MUpdate.plist (2016-03-30) [Support]

    [running]    com.zeobit.MacKeeper.Helper.plist (2011-11-24) [Support]

User Login Items: ⓘ

    Franklin Modem Status    Application Hidden (/Applications/Franklin Modem Status.app)

    HP Scheduler    Application  (/Library/Application Support/Hewlett-Packard/Software Update/HP Scheduler.app)

Internet Plug-ins: ⓘ

    Google Earth Web Plug-in: 5.1 (2009-11-11) [Support]

    RealPlayer Plugin: Unknown (2009-06-03) [Support]

    AdobePDFViewerNPAPI: 15.017.20053 - SDK 10.11 (2016-08-03) [Support]

    FlashPlayer-10.6: 23.0.0.162 - SDK 10.9 (2016-09-13) [Support]

    Silverlight: 4.0.50826.0 (2010-09-02) [Support]

    QuickTime Plugin: 7.7.3 (2016-09-13)

    Flash Player: 23.0.0.162 - SDK 10.9 (2016-09-13) [Support]

    Gears: 1.0 (2009-11-04) [Support]

    SharePointBrowserPlugin: 14.5.4 - SDK 10.6 (2015-09-07) [Support]

    AdobePDFViewer: 15.017.20053 - SDK 10.11 (2016-08-03) [Support]

    iPhotoPhotocast: 7.0 (2008-12-24)

    JavaAppletPlugin: 15.0.1 - SDK 10.7 (2013-10-26) Check version

User internet Plug-ins: ⓘ

    CitrixOnlineWebDeploymentPlugin: 1.0.105 (2013-04-25) [Support]

    WebEx64: 1.0 - SDK 10.6 (2014-12-29) [Support]

Safari Extensions: ⓘ

    Add To Amazon Wish List - Amazon.com - https://www.amazon.com/wishlist?ref=cm_wl_saf_ext (2013-10-23)

3rd Party Preference Panes: ⓘ

    Flash Player (2016-08-29) [Support]

Time Machine: ⓘ

    Skip System Files: NO

    Mobile backups: OFF

    Auto backup: YES

    Volumes being backed up:

    Destinations:

        iMac Backups [Local]

        Total size: 2.00 TB

        Total number of backups: 156

        Oldest backup: 3/11/14, 7:31 PM

        Last backup: 9/27/16, 6:26 AM

        Size of backup disk: Excellent

            Backup size 2.00 TB > (Disk size 0 B X 3)

Top Processes by CPU: ⓘ

        99%    LaCieRAIDMonitor

        92%    mdworker(27)

        14%    Mail

        10%    mds_stores

         9%    mds

Top Processes by Memory: ⓘ

    1.20 GB    kernel_task

    1.06 GB    mdworker(27)

    393 MB    Mail

    328 MB    AntiVirus

    328 MB    mds_stores

Virtual Memory Information: ⓘ

    3.46 GB    Free RAM

    13.00 GB    Used RAM (4.92 GB Cached)

    0 B    Swap Used

Diagnostics Information: ⓘ

    Sep 27, 2016, 09:14:48 AM    /Library/Logs/DiagnosticReports/WacomTabletDriver_2016-09-27-091448_[redacted]. crash

        /Library/Application Support/Tablet/WacomTabletDriver.app/Contents/MacOS/WacomTabletDriver

    Sep 27, 2016, 09:10:49 AM    Self test - passed

Ok, I'll get to work on that. Thank you!

I did remove the antivirus apps as you suggested and then restarted, starting back up in safe mode. Then, I restarted again through normal restart process, and everything was running fine until the computer went to sleep the first time. When I woke it and opened Finder to open a document the response was eternally slow. It did finally open the window, but when I selected a file I got the spinning wheel for so long that I tried the quit utility. Finder didn't show up in the quit utility as a running app, so I shut down the computer to reboot it again. During the next start up all I got was a white screen with a flashing folder icon with a question mark in it. I did a forced shut down by depressing the power button and then tried starting up again in restore mode, (Command + R). I can't restore though because now the hard drive doesn't show up when I get to the point where I have to select a destination drive. There simply isn't a drive listed. I opened the disk utility and verified the drive is present and working properly, so I assume the path to it is gone. At any rate, the computer can't find it, so I can't restore. It seems like my only option now is to go get an external hard drive and try restoring to that to see if I can get the computer working again. Any suggestions?