IMac crashes to black screen with white prohibitory sign!

My iMac (late 2013) i5 version keeps crashing about once a day.  Every time I come home from work, the screen is black with a white prohibitory sign displayed.  I'm unable to do anything and have to hold the power button down to restart it.  It seems to work fine after a restart, but randomly crashes to this same screen.  I've never actually seen it crash because it only happens when I'm not using the iMac.  It seems like it might be something with power management or screen saver.  Unfortunately, I can't seem to narrow it down as I've tried to change all the settings and it still happens.  I really don't want to do a complete re-install of Yosemite, but it seems like that's the only thing left to try.  Can someone please help?

EtreCheck version: 2.1.8 (121)
Report generated February 19, 2015 at 11:09:18 PM CST
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    iMac (27-inch, Late 2013) (Technical Specifications)
    iMac - model: iMac14,2
    1 3.2 GHz Intel Core i5 CPU: 4-core
    24 GB RAM Upgradeable
        BANK 0/DIMM0
            8 GB DDR3 1600 MHz ok
        BANK 1/DIMM0
            8 GB DDR3 1600 MHz ok
        BANK 0/DIMM1
            4 GB DDR3 1600 MHz ok
        BANK 1/DIMM1
            4 GB DDR3 1600 MHz ok
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless:  en1: 802.11 a/b/g/n/ac
Video Information: ℹ️
    NVIDIA GeForce GT 755M - VRAM: 1024 MB
        iMac 2560 x 1440
System Software: ℹ️
    OS X 10.10.2 (14C109) - Time since boot: 3:29:12
Disk Information: ℹ️
    APPLE SSD SD0128F disk0 : (121.33 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Boot OS X (disk0s3) <not mounted> : 134 MB
        Macintosh HD (disk2) / : 3.11 TB (1.80 TB free)
            Core Storage: disk0s2 120.99 GB Online
            Core Storage: disk1s2 3.00 TB Online
    APPLE HDD ST3000DM001 disk1 : (3 TB)
        EFI (disk1s1) <not mounted> : 210 MB
        Recovery HD (disk1s3) <not mounted>  [Recovery]: 650 MB
        Macintosh HD (disk2) / : 3.11 TB (1.80 TB free)
            Core Storage: disk0s2 120.99 GB Online
            Core Storage: disk1s2 3.00 TB Online
USB Information: ℹ️
    VIA Labs, Inc. USB3.0 Hub
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Inc. FaceTime HD Camera (Built-in)
    VIA Labs, Inc. USB2.0 Hub
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
    Anywhere
Kernel Extensions: ℹ️
        /Applications/Elgato Video Capture.app
    [not loaded]    com.elgato.driver.Pluto2 (1.1) [Click for support]
        /Applications/Toast 11 Titanium/Toast Titanium.app
    [not loaded]    com.roxio.TDIXController (2.0) [Click for support]
        /Applications/Wireless Auto Import.app
    [not loaded]    com.sony.driver.dsccamFirmwareUpdaterType00 (1 - SDK 10.5) [Click for support]
        /Library/Extensions
    [not loaded]    com.leapfrog.driver.LfConnectDriver (1.11.1 - SDK 10.10) [Click for support]
    [not loaded]    org.virtualbox.kext.VBoxDrv (4.2.18) [Click for support]
    [not loaded]    org.virtualbox.kext.VBoxNetAdp (4.2.18) [Click for support]
    [not loaded]    org.virtualbox.kext.VBoxNetFlt (4.2.18) [Click for support]
    [not loaded]    org.virtualbox.kext.VBoxUSB (4.2.18) [Click for support]
        /System/Library/Extensions
    [not loaded]    com.Belcarra.iokit.USBLAN_netpart (3.1.1 - SDK 10.6) [Click for support]
    [not loaded]    com.Belcarra.iokit.USBLAN_usbpart (3.1.1 - SDK 10.6) [Click for support]
    [loaded]    com.Cycling74.driver.Soundflower (1.6.6 - SDK 10.6) [Click for support]
    [not loaded]    com.RemoteControl.USBLAN.usbpart (3.1.1 - SDK 10.7) [Click for support]
    [not loaded]    com.dvdfab.kext.fabio (1) [Click for support]
    [not loaded]    com.leapfrog.codeless.kext (2) [Click for support]
    [not loaded]    com.makemkv.kext.daspi (1) [Click for support]
    [not loaded]    com.pctools.iantivirus.kfs (1.0.1) [Click for support]
    [not loaded]    com.rogueamoeba.InstantOn (6.0.3 - SDK 10.6) [Click for support]
    [not loaded]    com.roxio.BluRaySupport (1.1.6) [Click for support]
    [not loaded]    com.vara.driver.VaraAudio (1.0.2) [Click for support]
        /System/Library/Extensions/InstantOn.kext/Contents/PlugIns
    [not loaded]    com.rogueamoeba.InstantOnCore (6.0.3 - SDK 10.6) [Click for support]
Startup Items: ℹ️
    VirtualBox: Path: /Library/StartupItems/VirtualBox
    Startup items are obsolete in OS X Yosemite
Launch Agents: ℹ️
    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [failed]    com.amazon.sendtokindle.launcher.plist [Click for support]
    [loaded]    com.citrix.AuthManager_Mac.plist [Click for support]
    [running]    com.citrix.ServiceRecords.plist [Click for support]
    [loaded]    com.google.keystone.agent.plist [Click for support]
    [loaded]    com.oracle.java.Java-Updater.plist [Click for support]
    [running]    com.sony.WirelessAutoImportLauncher.agent.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [not loaded]    com.adobe.SwitchBoard.plist [Click for support]
    [running]    com.backblaze.bzserv.plist [Click for support]
    [not loaded]    com.barebones.textwrangler.plist [Click for support]
    [running]    com.cleverfiles.cfbackd.plist [Click for support]
    [loaded]    com.google.keystone.daemon.plist [Click for support]
    [loaded]    com.leapfrog.connect.authdaemon.plist [Click for support]
    [loaded]    com.leapfrog.connect2.authdaemon.plist [Click for support]
    [not loaded]    com.mac.adg.SquidMan.plist [Click for support]
    [not loaded]    com.macserve.ppp.l2tp.plist [Click for support]
    [not loaded]    com.macserve.ppp.pptp.plist [Click for support]
    [failed]    com.magican.castle.plist [Click for support]
    [loaded]    com.oracle.java.Helper-Tool.plist [Click for support]
    [loaded]    com.oracle.java.JavaUpdateHelper.plist [Click for support]
    [loaded]    jp.co.canon.MasterInstaller.plist [Click for support]
User Launch Agents: ℹ️
    [running]    com.backblaze.bzbmenu.plist [Click for support]
    [running]    com.leapfrog.connect.monitor.plist [Click for support]
    [running]    com.leapfrog.connect2.lflauncher.plist [Click for support]
    [not loaded]    jp.co.canon.Inkjet_Extended_Survey_Agent.plist [Click for support]
    [failed]    ws.agile.1PasswordAgent.plist [Click for support] [Click for details]
User Login Items: ℹ️
    iTunesHelper    Application Hidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Dropbox    Application Hidden (/Applications/Dropbox.app)
    Canon IJ Network Scanner Selector EX    Application Hidden (/Applications/Canon Utilities/IJ Network Scanner Selector EX/Canon IJ Network Scanner Selector EX.app)
    Google Drive    Application Hidden (/Applications/Google Drive.app)
    Plex Media Server    Application Hidden (/Applications/Plex Media Server.app)
    Music Manager    UNKNOWN Hidden (missing value)
    Music Manager    Application Hidden (/Users/[redacted]/Library/PreferencePanes/MusicManager.prefPane/Contents/Helpe rs/MusicManagerHelper.app)
Internet Plug-ins: ℹ️
    EPPEX Plugin: Version: 10.0 [Click for support]
    Flash Player: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    OfficeLiveBrowserPlugin: Version: 12.2.0 [Click for support]
    LogMeInSafari32: Version: 1.0.586 [Click for support]
    googletalkbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
    AdobeExManDetect: Version: AdobeExManDetect 1.1.0.0 - SDK 10.7 [Click for support]
    iPhotoPhotocast: Version: 7.0
    RayV: Version: 2.0.3.1 [Click for support]
    DirectorShockwave: Version: 11.6.4r634 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    LogMeInSafari64: Version: 1.0.586 [Click for support]
    FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    CitrixICAClientPlugIn: Version: 1.0 - SDK 10.6 [Click for support]
    GarminGpsControl: Version: 4.0.4.0 Release - SDK 10.6 [Click for support]
    DivXBrowserPlugin: Version: 2.0 [Click for support]
    Silverlight: Version: 5.1.30514.0 - SDK 10.6 [Click for support]
    LogMeIn: Version: 1.0.586 [Click for support]
    Google Earth Web Plug-in: Version: 6.0 [Click for support]
    LogitechHarmony: Version: 2.0 - SDK 10.7 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    Flip4Mac WMV Plugin: Version: 3.0.0.126   - SDK 10.8 [Click for support]
    o1dbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
    JavaAppletPlugin: Version: Java 8 Update 31 Check version
    JoostPlugin: Version: 0.14.8 [Click for support]
Safari Extensions: ℹ️
    1Password
    Add To Amazon Wish List
    FastestTube
    Evernote Web Clipper
    Pin It Button
3rd Party Preference Panes: ℹ️
    Backblaze Backup  [Click for support]
    Citrix ShareFile Sync  [Click for support]
    DivX  [Click for support]
    Flash Player  [Click for support]
    Flip4Mac WMV  [Click for support]
    Java  [Click for support]
    MusicManager  [Click for support]
    Perian  [Click for support]
Time Machine: ℹ️
    Skip System Files: NO
    Mobile backups: OFF
    Auto backup: YES
    Volumes being backed up:
        Macintosh HD: Disk size: 3.11 TB Disk used: 1.32 TB
    Destinations:
        Backups.backupdb [Network]
        Total size: 5.00 TB
        Total number of backups: 40
        Oldest backup: 2015-01-15 22:28:41 +0000
        Last backup: 2015-02-20 04:34:32 +0000
        Size of backup disk: Adequate
            Backup size 5.00 TB > (Disk used 1.32 TB X 3)
Top Processes by CPU: ℹ️
         4%    WindowServer
         2%    plugin-container
         0%    usbmuxd
         0%    Plex Plug-in [com.plexapp.system]
         0%    Safari
Top Processes by Memory: ℹ️
    438 MB    softwareupdated
    309 MB    mds_stores
    258 MB    Safari
    258 MB    firefox
    232 MB    iTunes
Virtual Memory Information: ℹ️
    12.78 GB    Free RAM
    7.34 GB    Active RAM
    3.84 GB    Inactive RAM
    1.81 GB    Wired RAM
    6.78 GB    Page-ins
    0 B    Page-outs
Diagnostics Information: ℹ️
    Feb 19, 2015, 07:39:44 PM    Self test - passed
    Feb 18, 2015, 02:03:17 AM    /Library/Logs/DiagnosticReports/Plex Media Server_2015-02-18-020317_[redacted].cpu_resource.diag [Click for details]
    Feb 17, 2015, 02:03:05 AM    /Library/Logs/DiagnosticReports/Plex Media Server_2015-02-17-020305_[redacted].cpu_resource.diag [Click for details]

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