OS X is halting on boot after update

Problem description:
System is halted (frozen) when fully loaded. It’s able to run a one app before that (and it will work fine), but not any other app then. Even system reboot is unavailable.
EtreCheck version: 2.1.8 (121)
Report generated 12 Apr 2015 19:23:56 CEST
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
    Mac mini (Late 2012) (Technical Specifications)
    Mac mini - model: Macmini6,1
    1 2.5 GHz Intel Core i5 CPU: 2-core
    16 GB RAM Upgradeable
        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: ℹ️
    Intel HD Graphics 4000
        Panasonic-TV 1920 x 1080 @ 50 Hz
System Software: ℹ️
    OS X 10.10.3 (14D131) - Time since boot: 0:12:43
Disk Information: ℹ️
    APPLE HDD HTS545050A7E362 disk1 : (500,11 GB)
        EFI (disk1s1) <not mounted> : 210 MB
        Storage (disk1s2) /Volumes/Storage : 499.76 GB (228.25 GB free)
    OCZ-AGILITY3 disk0 : (256,06 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 255.20 GB (134.13 GB free)
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
USB Information: ℹ️
    Apple Inc. iPhone
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple, Inc. IR Receiver
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Configuration files: ℹ️
    /etc/hosts - Count: 25
Gatekeeper: ℹ️
    Anywhere
Kernel Extensions: ℹ️
        /Library/Application Support/VirtualBox
    [not loaded]    org.virtualbox.kext.VBoxDrv (4.3.26) [Click for support]
    [not loaded]    org.virtualbox.kext.VBoxNetAdp (4.3.26) [Click for support]
    [not loaded]    org.virtualbox.kext.VBoxNetFlt (4.3.26) [Click for support]
    [not loaded]    org.virtualbox.kext.VBoxUSB (4.3.26) [Click for support]
        /System/Library/Extensions
    [not loaded]    com.Cycling74.driver.Soundflower (1.6.6 - SDK 10.6) [Click for support]
    [not loaded]    com.seagate.driver.PowSecDriverCore (5.2.6 - SDK 10.4) [Click for support]
        /System/Library/Extensions/Seagate Storage Driver.kext/Contents/PlugIns
    [not loaded]    com.seagate.driver.PowSecLeafDriver_10_4 (5.2.6 - SDK 10.4) [Click for support]
    [not loaded]    com.seagate.driver.PowSecLeafDriver_10_5 (5.2.6 - SDK 10.5) [Click for support]
    [not loaded]    com.seagate.driver.SeagateDriveIcons (5.2.6 - SDK 10.4) [Click for support]
Problem System Launch Daemons: ℹ️
    [failed]    com.apple.watchdogd.plist [Click for details]
    [running]    com.seagate.TBDecorator.plist [Click for support]
Launch Agents: ℹ️
    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [not loaded]    com.google.keystone.agent.plist [Click for support]
    [not loaded]    com.oracle.java.Java-Updater.plist [Click for support]
    [not loaded]    com.teamviewer.teamviewer.plist [Click for support]
    [not loaded]    com.teamviewer.teamviewer_desktop.plist [Click for support]
    [not loaded]    org.chromium.chromoting.plist [Click for support]
    [not loaded]    org.macosforge.xquartz.startx.plist [Click for support]
Launch Daemons: ℹ️
    [not loaded]    com.google.keystone.daemon.plist [Click for support]
    [not loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
    [not loaded]    com.oracle.java.Helper-Tool.plist [Click for support]
    [not loaded]    com.oracle.java.JavaUpdateHelper.plist [Click for support]
    [not loaded]    com.skype.skypeinstaller.plist [Click for support]
    [not loaded]    com.teamviewer.Helper.plist [Click for support]
    [not loaded]    com.teamviewer.teamviewer_service.plist [Click for support]
    [not loaded]    org.macosforge.xquartz.privileged_startx.plist [Click for support]
    [not loaded]    org.virtualbox.startup.plist [Click for support]
User Launch Agents: ℹ️
    [not loaded]    com.adobe.ARM.[...].plist [Click for support]
    [not loaded]    com.coppertino.VoxHelper.plist [Click for support]
    [not loaded]    com.google.Chrome.framework.plist [Click for support]
    [not loaded]    com.remysaissy.mongodbprefspane.plist.disabled [Click for support]
    [not loaded]    com.vemedio.Snowtape.RadioAgent.plist [Click for support]
    [not loaded]    org.virtualbox.vboxwebsrv.plist [Click for support]
User Login Items: ℹ️
    iSyncr    Application  (/Applications/iSyncr.app)
    Flux    Application  (/Applications/Flux.app)
    iTunesHelper    Application  (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    BitTorrent Sync    Application  (/Applications/BitTorrent Sync.app)
    Dropbox    Application  (/Applications/Dropbox.app)
    Google Drive    Application  (/Applications/Google Drive.app)
    Android File Transfer Agent    Application  (/Users/[redacted]/Library/Application Support/Google/Android File Transfer/Android File Transfer Agent.app)
    360云盘    Application  (/Applications/360云盘.app)
Internet Plug-ins: ℹ️
    AdobeAAMDetect: Version: AdobeAAMDetect 1.0.0.0 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    AdobePDFViewerNPAPI: Version: 11.0.10 - SDK 10.6 [Click for support]
    AdobePDFViewer: Version: 11.0.10 - SDK 10.6 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    VLC Plugin: Version: 2.2.0 [Click for support]
    JavaAppletPlugin: Version: Java 8 Update 31 Check version
3rd Party Preference Panes: ℹ️
    remoting_host_prefpane  [Click for support]
    Java  [Click for support]
    MongoDB  [Click for support]
    MusicManager  [Click for support]
    Seagate Dashboard for Mac OSX  [Click for support]
    VOX Preferences  [Click for support]
Time Machine: ℹ️
    Time Machine not configured!
Top Processes by CPU: ℹ️
        10%    WindowServer
         3%    Google Chrome
         1%    ps
         0%    blued
         0%    hidd
Top Processes by Memory: ℹ️
    241 MB    Google Chrome
    161 MB    Google Chrome Helper
    155 MB    Console
    155 MB    WindowServer
    120 MB    Finder
Virtual Memory Information: ℹ️
    9.31 GB    Free RAM
    5.49 GB    Active RAM
    1.22 GB    Inactive RAM
    1.15 GB    Wired RAM
    1.88 GB    Page-ins
    0 B    Page-outs
Diagnostics Information: ℹ️
    Apr 12, 2015, 07:17:36 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/mdworker_2015-04-12-191736_[re dacted].crash
    Apr 12, 2015, 07:10:30 PM    Self test - passed
    Apr 12, 2015, 07:10:11 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-191011_ [redacted].crash
    Apr 12, 2015, 07:10:08 PM    /Library/Logs/DiagnosticReports/Terminal_2015-04-12-191008_[redacted].hang
    Apr 12, 2015, 07:10:01 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-191001_ [redacted].crash
    Apr 12, 2015, 07:09:51 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-190951_ [redacted].crash
    Apr 12, 2015, 07:09:41 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-190941_ [redacted].crash
    Apr 12, 2015, 07:09:30 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-190930_ [redacted].crash
    Apr 12, 2015, 07:09:20 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-190920_ [redacted].crash
    Apr 12, 2015, 07:09:10 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-190910_ [redacted].crash
    Apr 12, 2015, 07:09:00 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-190900_ [redacted].crash
    Apr 12, 2015, 07:08:50 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-190850_ [redacted].crash
    Apr 12, 2015, 07:08:39 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-190839_ [redacted].crash
    Apr 12, 2015, 07:08:29 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-190829_ [redacted].crash
    Apr 12, 2015, 07:08:19 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-190819_ [redacted].crash
    Apr 12, 2015, 07:08:09 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-190809_ [redacted].crash
    Apr 12, 2015, 07:08:00 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-190800_ [redacted].crash
    Apr 12, 2015, 06:58:57 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-185857_ [redacted].crash
    Apr 12, 2015, 06:58:47 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-185847_ [redacted].crash
    Apr 12, 2015, 06:58:37 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-185837_ [redacted].crash
    Apr 12, 2015, 06:58:27 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-185827_ [redacted].crash
    Apr 12, 2015, 06:58:17 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-185817_ [redacted].crash
    Apr 12, 2015, 06:58:07 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/CVMCompiler_2015-04-12-185807_ [redacted].crash
    Apr 12, 2015, 02:48:45 PM    /Library/Logs/DiagnosticReports/remoting_me2me_host_2015-04-12-144845_[redacted ].crash
    Apr 12, 2015, 02:32:10 PM    /Library/Logs/DiagnosticReports/remoting_me2me_host_2015-04-12-143210_[redacted ].crash
    Apr 12, 2015, 02:07:33 PM    /Library/Logs/DiagnosticReports/WindowServer_2015-04-12-140733_[redacted].crash
    Apr 12, 2015, 12:59:31 PM    /Library/Logs/DiagnosticReports/BitdefenderVirusScanner_2015-04-12-125931_[reda cted].cpu_resource.diag [Click for details]
    Apr 12, 2015, 12:35:03 PM    /Library/Logs/DiagnosticReports/Disk Utility_2015-04-12-123503_[redacted].hang
    Apr 12, 2015, 12:22:30 PM    /Library/Logs/DiagnosticReports/com.apple.AmbientDisplayAgent_2015-04-12-122230 _[redacted].crash
    Apr 12, 2015, 11:58:31 AM    /Library/Logs/DiagnosticReports/storedownloadd_2015-04-12-115831_[redacted].cpu _resource.diag [Click for details]
    Apr 12, 2015, 11:44:01 AM    /Library/Logs/DiagnosticReports/installd_2015-04-12-114401_[redacted].cpu_resou rce.diag [Click for details]
    Apr 12, 2015, 10:21:45 AM    /Library/Logs/DiagnosticReports/Google Chrome_2015-04-12-102145_[redacted].hang
    Apr 12, 2015, 10:21:11 AM    /Library/Logs/DiagnosticReports/App Store_2015-04-12-102111_[redacted].hang
    Apr 12, 2015, 10:21:09 AM    /Library/Logs/DiagnosticReports/com.apple.WebKit.WebContent_2015-04-12-102109_[ redacted].hang
    Apr 12, 2015, 09:55:44 AM    /Library/Logs/DiagnosticReports/remoting_me2me_host_2015-04-12-095544_[redacted ].crash
    Apr 12, 2015, 09:51:08 AM    /Library/Logs/DiagnosticReports/Google Drive_2015-04-12-095108_[redacted].crash
    Apr 12, 2015, 12:44:44 AM    /Library/Logs/DiagnosticReports/remoting_me2me_host_2015-04-12-004444_[redacted ].crash
    Apr 11, 2015, 03:55:07 PM    /Library/Logs/DiagnosticReports/remoting_me2me_host_2015-04-11-155507_[redacted ].crash
    Apr 11, 2015, 03:53:24 PM    /Library/Logs/DiagnosticReports/Google Drive_2015-04-11-155324_[redacted].crash
    Apr 11, 2015, 01:35:11 PM    /Library/Logs/DiagnosticReports/remoting_me2me_host_2015-04-11-133511_[redacted ].crash
    Apr 11, 2015, 10:50:50 AM    /Library/Logs/DiagnosticReports/discoveryd_2015-04-11-105050_[redacted].crash
    Apr 6, 2015, 12:22:47 PM    /Library/Logs/DiagnosticReports/Kernel_2015-04-06-122247_[redacted].panic [Click for details]
    Apr 12, 2015, 10:46:20 AM    /Library/Logs/DiagnosticReports/remoting_me2me_host_2015-04-12-104620_[redacted ].crash

Hello SuzyParkerfan,
The article linked below details a number of troubleshooting steps that can help get your Mac to boot successfully.
Mac OS X: Gray screen appears during startup
http://support.apple.com/en-us/TS2570
Cheers,
Allen

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