OS X Stuck at grey screen, while bootcamp starts up normally

Hello,
When I try to start up on my OS X it doesn't work. The screen is stuck at the grey screen with the spinning wheel. While I try to start up bootcamp (Windows 8) everything works and I can do everything.
I tried everything (Safe boot, reset NVRAM / PRAM), doesn't work.
Does anyone has a suggestion of what I can do?
My conclusion: there can't be any hardware failure because bootcamp is performing normally.
By the way, yesterday I was still able to get into my OS X and work normally. I have no idea what could've happened.

Alright, I think I have to replace some files to my external disk. Which isn't a problem.
Etrecheck report:
Hardware Information:
          MacBook Pro (Retina, Mid 2012)
          MacBook Pro - model: MacBookPro10,1
          1 2.3 GHz Intel Core i7 CPU: 4 cores
          8 GB RAM
Video Information:
          Intel HD Graphics 4000 - VRAM: 1024 MB
          NVIDIA GeForce GT 650M - VRAM: 1024 MB
System Software:
          OS X 10.9.1 (13B42) - Uptime: 0 days 0:52:16
Disk Information:
          APPLE SSD SM256E disk0 : (251 GB)
                    EFI (disk0s1) <not mounted>: 209,7 MB
                    Macintosh HD (disk0s2) /: 195,14 GB (23,04 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
                    Windows 8 (disk0s4) /Volumes/Windows 8: 55 GB (3,52 GB free)
USB Information:
          Western Digital Elements 1042 1 TB
                    EFI (disk1s1) <not mounted>: 209,7 MB
                    Angelo (disk1s2) /Volumes/Angelo: 999,86 GB (682,83 GB free)
          Western Digital Ext HDD 1021 1 TB
                    MANON (disk2s1) /Volumes/MANON: 1 TB (861,67 GB free)
          Apple Inc. FaceTime HD Camera (Built-in)
          Apple Inc. Apple Internal Keyboard / Trackpad
          Apple Inc. BRCM20702 Hub
                    Apple Inc. Bluetooth USB Host Controller
FireWire Information:
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
                    Apple Inc. Thunderbolt to Gigabit Ethernet Adapter
Kernel Extensions:
          com.orderedbytes.driver.CMUSBDevices          (4.6.0 - SDK 10.6)
          com.cyberic.SmoothMouse          (7 - SDK 10.8)
          com.orderedbytes.driver.ControllerMateFamily          (4.6.0 - SDK 10.6)
          com.Cycling74.driver.Soundflower          (1.6.6 - SDK 10.6)
          com.waves.driver.soundgrid          (2.0.0)
          com.bresink.driver.BRESINKx86Monitoring          (9.0)
Startup Items:
          MySql_init: Path: /Library/StartupItems/MySql_init
Problem System Launch Daemons:
Problem System Launch Agents:
Launch Daemons:
          [loaded] com.adobe.fpsaud.plist 3rd-Party support link
          [loaded] com.adobe.SwitchBoard.plist 3rd-Party support link
          [loaded] com.github.GitHub.GHInstallCLI.plist 3rd-Party support link
          [loaded] com.google.keystone.daemon.plist 3rd-Party support link
          [loaded] com.microsoft.office.licensing.helper.plist 3rd-Party support link
          [loaded] com.waves.daemon.SoundGridProtocolService.plist 3rd-Party support link
          [loaded] org.macosforge.xquartz.privileged_startx.plist 3rd-Party support link
Launch Agents:
          [not loaded] com.adobe.AAM.Updater-1.0.plist 3rd-Party support link
          [loaded] com.google.keystone.agent.plist 3rd-Party support link
          [loaded] com.MadCatz.MadCatzSmartTechnology.plist 3rd-Party support link
          [loaded] com.orderedbytes.ControllerMateHelper.plist 3rd-Party support link
          [loaded] net.culater.SIMBL.Agent.plist 3rd-Party support link
          [loaded] org.macosforge.xquartz.startx.plist 3rd-Party support link
User Launch Agents:
          [failed] com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist 3rd-Party support link
          [loaded] com.cyberic.smoothmouse.plist 3rd-Party support link
          [loaded] com.cyberic.smoothmouseupdater.plist 3rd-Party support link
          [not loaded] com.linotype.FontFolderProtector.plist 3rd-Party support link
          [loaded] com.spotify.webhelper.plist 3rd-Party support link
          [loaded] com.valvesoftware.steamclean.plist 3rd-Party support link
User Login Items:
          iTunesHelper
          Dropbox
          Spotify
Internet Plug-ins:
          o1dbrowserplugin: Version: 5.1.2.17113 3rd-Party support link
          Default Browser: Version: 537 - SDK 10.9
          AdobeExManDetect: Version: AdobeExManDetect 1.1.0.0 - SDK 10.7 3rd-Party support link
          AdobeAAMDetect: Version: AdobeAAMDetect 1.0.0.0 - SDK 10.6 3rd-Party support link
          FlashPlayer-10.6: Version: 11.9.900.170 - SDK 10.6 3rd-Party support link
          Silverlight: Version: 5.1.20913.0 - SDK 10.6 3rd-Party support link
          Flash Player: Version: 11.9.900.170 - SDK 10.6 Outdated! Update
          QuickTime Plugin: Version: 7.7.3
          googletalkbrowserplugin: Version: 5.1.2.17113 3rd-Party support link
          SharePointBrowserPlugin: Version: 14.0.0 3rd-Party support link
          npgtpo3dautoplugin: Version: 0.1.44.29 - SDK 10.5 3rd-Party support link
          JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Outdated! Update
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 1.9 - SDK 10.9
          AppleAVBAudio: Version: 2.0.0 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
3rd Party Preference Panes:
          Flash Player  3rd-Party support link
          Mouse Acceleration  3rd-Party support link
          RAT  3rd-Party support link
          SmoothMouse  3rd-Party support link
Bad Fonts:
          None
Old Applications:
          dynamiclinkmediaserver:          Version: 6.0.1 - SDK 10.5 3rd-Party support link
                    /Library/Application Support/Adobe/Common/dynamiclinkmediaserver/1.0/dynamiclinkmediaserver.app
          FontExplorerXAutoload:          Version: 4.0 - SDK 10.4 3rd-Party support link
                    /Users/[redacted]/Library/Application Support/Linotype/FontExplorer X/FontExplorerXAutoload.app
          SLLauncher:          Version: 1.0 - SDK 10.5 3rd-Party support link
                    /Library/Application Support/Microsoft/Silverlight/OutOfBrowser/SLLauncher.app
          /Applications/Melodyne singletrack
                    Melodyne singletrack Uninstaller:          Version: 2.0.1 - SDK 10.5 3rd-Party support link
                    Melodyne singletrack:          Version: 2.0.1 - SDK 10.5 3rd-Party support link
          Melodyne singletrack Licenser:          Version: 2.0.1 - SDK 10.5 3rd-Party support link
                    /Library/Application Support/Celemony/Licenser/Melodyne singletrack Licenser.app
          dynamiclinkmanager:          Version: 6.0.0 - SDK 10.5 3rd-Party support link
                    /Library/Application Support/Adobe/Common/dynamiclink/CS6/dynamiclinkmanager.app
          /Applications/Arturia
                    ARP2600 V2:          Version: 2.5.3 - SDK 10.5 3rd-Party support link
                    CS-80V2:          Version: 2.5.3 - SDK 10.5 3rd-Party support link
          Install Spotify:          Version: 1.0 - SDK 10.5 3rd-Party support link
                    /Users/Manon/Downloads/Install Spotify.app
          Spotify:          Version: 0.8.5.1333.g822e0de8 - SDK 10.5 3rd-Party support link
                    /Users/Manon/Applications/Spotify.app
          VLC:          Version: 2.0.2 - SDK 10.5 3rd-Party support link
          Authorizer:          Version: 1.0.5 - SDK 10.4 3rd-Party support link
          Sequel Pro:          Version: 1.0.2 - SDK 10.5 3rd-Party support link
          TransType 3 Pro:          Version: 3.1.1 - SDK 10.5 3rd-Party support link
          Transmit:          Version: 4.1.9 - SDK 10.5 3rd-Party support link
          FontExplorer X Pro:          Version: 3.5 - SDK 10.4 3rd-Party support link
          Authorization Manager:          Version: 1.0 - SDK 10.4 3rd-Party support link
Time Machine:
          Mobile backups: OFF
          Auto backup: NO - Auto backup turned off
          Time Machine not configured!
Top Processes by CPU:
               5%          WindowServer
               3%          Finder
               2%          MadCatzSmartTechnology
               2%          SGProtocolService
               1%          EtreCheck
Top Processes by Memory:
          328 MB          WindowServer
          328 MB          Dock
          311 MB          Pages
          229 MB          Finder
          205 MB          Mail
Virtual Memory Information:
          1.98 GB          Free RAM
          4.40 GB          Active RAM
          590 MB          Inactive RAM
          1.04 GB          Wired RAM
          850 MB          Page-ins
          0 B          Page-outs

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    Step 7
    If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
    Start up in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Post for further instructions.
    Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
    The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
    When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 10. If you ever have another problem with the drive, replace it immediately.
    If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
    If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
    Step 8
    Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
    This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
    Step 9
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  • After boot back from windows to OS X it stuck at grey screen

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    Reinstalling Lion/Mountain Lion Without Erasing the Drive
    Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
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    When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
    Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Continue button.
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  • Need Help For iMac G5 Stuck On Grey Screen Or Apple Logo No Spinning Gear!

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    Hoping to get result for all of you guys P.S
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    You need to have the install DVD that was issued with the iMac
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  • Powermac G5 stuck on grey screen start up and fans running wild

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    Follow these steps in order:
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    The G5 is also subject to solder failure around the RAM slots and memory controller.
    It is a fatal condition, but one that can sometimes be temporarily sidestepped by heating the logic board between the RAM slots with a hair dryer.
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  • Stuck on grey screen screen at start up...apparent Qmaster bug.

    So I found what appears to be a bug. At least for me...and at least in 10.6. Not sure if this effects other OS versions.
    I was having an issue with start up getting stuck on grey screen. Symptom is eventually start-up circle segments would stop spinning and left hanging there on the grey screen.
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    My issue:
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    Issues like this are often caused by startup jobs that are taking far too long to finish. It definitely looks like a serious bug so it's worth reporting it to Apple at either of the following places:
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  • STUCK ON GREY SCREEN! !PLEASE HELP!

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    Hi Eug07349,
    Thanks for visiting Apple Support Communities.
    It sounds like you may be experiencing a software issue. I'd suggest trying the first two steps in this article (Disconnect, test peripheral devices and network cables, Perform a Safe Boot):
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    http://support.apple.com/kb/ts2570
    Best,
    Jeremy

  • I have snow leopard installed as an OS.  When trying to reboot a MacBook Pro I am getting stuck on grey screen with apple logo and rotating symbol.  What can I do?

    I have snow leopard installed as an OS.  When trying to reboot a MacBook Pro I am getting stuck on grey screen with apple logo and rotating symbol.  What can I do?

    Maybe this might help.
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  • MacBook Pro stuck at grey screen after Yosemite upgrade

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    If you can't start up and log in in the usual way, try in safe mode.
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    I know the report is long, maybe several hundred lines. Please post all of it anyway.
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    Please don’t post other kinds of diagnostic report.

  • Start up screen stuck on grey screen with apple logo and spinning gear

    Start up screen is stuck on grey screen with apple logo and spinning gear. What should I do?

    See this thread with dominic23’s suggestions:  https://discussions.apple.com/thread/5783326?tstart=0

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