My mac screen turns black after 3 hours

when i use my iMac for about 3 hours suddenly the screen turns white or black. Does anyone has the same problem. How can i fix it?

When the screen turns black is it completely dark? If you turn out the lights and iew it in a darkened room can you see a glow from the display (indicating that the backlights are still on)?
When the display turns black or white, is it solid black or white, or are there other artificacts visible? If there are other artifacts visible could you take a picture of them and post them?
When the display turns black or white, press the caps lock key. Does the green caps lock LED light up? If yes, this indicates that the OS is still functioning at some level and that you are probably experiencing some sort of display or graphics card software or hardware issue.
When did the issue start occurring? Your profile indicates you are running 10.7.3. Was the issue occurring prior to installing 10.7.3? Have you tried reinstalling the OS?
How to Reinstall Mac OS X Lion

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    1) pacman.log
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    [2013-11-10 15:08] [PACMAN] upgraded openssl (1.0.1.e-4 -> 1.0.1.e-5)
    [2013-11-10 15:08] [PACMAN] upgraded openssh (6.3p1-1 -> 6.4p1-1)
    [2013-11-10 15:08] [PACMAN] upgraded phonon-vlc (0.7.0-1 -> 0.7.0-2)
    [2013-11-10 15:08] [PACMAN] upgraded xcb-proto (1.8-2 -> 1.9-1)
    [2013-11-10 15:08] [PACMAN] upgraded xf86-video-nouveau (1.0.9-1 -> 1.0.10-1)
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    [2013-11-10 21:38] [PACMAN] installed lib32-glu (9.0.0-2)
    [2013-11-10 21:38] [PACMAN] Running '/usr/bin/pacman -S --asdeps fontforge prelink gcc-multilib>=4.5.0-2 lib32-giflib lib32-gnutls lib32-libxinerama lib32-libxcomposite lib32-libxmu lib32-libxml2 lib32-libldap lib32-lcms lib32-mpg123 lib32-openal lib32-libcl samba opencl-headers'
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    #2)
    [ 4.198]
    X.Org X Server 1.14.4
    Release Date: 2013-10-31
    [ 4.198] X Protocol Version 11, Revision 0
    [ 4.198] Build Operating System: Linux 3.11.6-1-ARCH x86_64
    [ 4.198] Current Operating System: Linux zen 3.12.0-1-ARCH #1 SMP PREEMPT Wed Nov 6 09:06:27 CET 2013 x86_64
    [ 4.198] Kernel command line: vmlinuz-arch.efi root=/dev/md125p3 ro rootfstype=ext4 systemd.unit=graphical.target init=/usr/lib/systemd/systemd initrd=\EFI\arch\initramfs-arch.img
    [ 4.198] Build Date: 01 November 2013 05:10:48PM
    [ 4.198]
    [ 4.198] Current version of pixman: 0.32.2
    [ 4.198] Before reporting problems, check [url]http://wiki.x.org[/url]
    to make sure that you have the latest version.
    [ 4.198] Markers: (--) probed, (**) from config file, (==) default setting,
    (++) from command line, (!!) notice, (II) informational,
    (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
    [ 4.198] (==) Log file: "/var/log/Xorg.0.log", Time: Sat Nov 16 14:35:54 2013
    [ 4.202] (==) Using config file: "/etc/X11/xorg.conf"
    [ 4.202] (==) Using config directory: "/etc/X11/xorg.conf.d"
    [ 4.207] (==) ServerLayout "Layout0"
    [ 4.207] (**) |-->Screen "Screen0" (0)
    [ 4.207] (**) | |-->Monitor "Monitor0"
    [ 4.208] (**) | |-->Device "Device0"
    [ 4.208] (**) |-->Input Device "Keyboard0"
    [ 4.208] (**) |-->Input Device "Mouse0"
    [ 4.208] (==) Automatically adding devices
    [ 4.208] (==) Automatically enabling devices
    [ 4.208] (==) Automatically adding GPU devices
    [ 4.215] (WW) The directory "/usr/share/fonts/OTF/" does not exist.
    [ 4.215] Entry deleted from font path.
    [ 4.223] (==) FontPath set to:
    /usr/share/fonts/misc/,
    /usr/share/fonts/TTF/,
    /usr/share/fonts/Type1/,
    /usr/share/fonts/100dpi/,
    /usr/share/fonts/75dpi/
    [ 4.223] (==) ModulePath set to "/usr/lib/xorg/modules"
    [ 4.223] (WW) Hotplugging is on, devices using drivers 'kbd', 'mouse' or 'vmmouse' will be disabled.
    [ 4.223] (WW) Disabling Keyboard0
    [ 4.223] (WW) Disabling Mouse0
    [ 4.223] (II) Loader magic: 0x7fdc20
    [ 4.223] (II) Module ABI versions:
    [ 4.223] X.Org ANSI C Emulation: 0.4
    [ 4.223] X.Org Video Driver: 14.1
    [ 4.223] X.Org XInput driver : 19.1
    [ 4.223] X.Org Server Extension : 7.0
    [ 4.223] (II) xfree86: Adding drm device (/dev/dri/card1)
    [ 4.223] (II) xfree86: Adding drm device (/dev/dri/card0)
    [ 4.224] (--) PCI:*(0:0:2:0) 8086:0166:1043:15a7 rev 9, Mem @ 0xf7400000/4194304, 0xd0000000/268435456, I/O @ 0x0000f000/64
    [ 4.224] (--) PCI: (0:1:0:0) 10de:0fd1:1043:15a7 rev 161, Mem @ 0xf6000000/16777216, 0xe0000000/268435456, 0xf0000000/33554432, I/O @ 0x0000e000/128, BIOS @ 0x????????/524288
    [ 4.225] Initializing built-in extension Generic Event Extension
    [ 4.225] Initializing built-in extension SHAPE
    [ 4.225] Initializing built-in extension MIT-SHM
    [ 4.225] Initializing built-in extension XInputExtension
    [ 4.225] Initializing built-in extension XTEST
    [ 4.225] Initializing built-in extension BIG-REQUESTS
    [ 4.225] Initializing built-in extension SYNC
    [ 4.225] Initializing built-in extension XKEYBOARD
    [ 4.225] Initializing built-in extension XC-MISC
    [ 4.225] Initializing built-in extension SECURITY
    [ 4.225] Initializing built-in extension XINERAMA
    [ 4.225] Initializing built-in extension XFIXES
    [ 4.225] Initializing built-in extension RENDER
    [ 4.225] Initializing built-in extension RANDR
    [ 4.225] Initializing built-in extension COMPOSITE
    [ 4.225] Initializing built-in extension DAMAGE
    [ 4.225] Initializing built-in extension MIT-SCREEN-SAVER
    [ 4.225] Initializing built-in extension DOUBLE-BUFFER
    [ 4.225] Initializing built-in extension RECORD
    [ 4.225] Initializing built-in extension DPMS
    [ 4.225] Initializing built-in extension X-Resource
    [ 4.225] Initializing built-in extension XVideo
    [ 4.225] Initializing built-in extension XVideo-MotionCompensation
    [ 4.225] Initializing built-in extension XFree86-VidModeExtension
    [ 4.225] Initializing built-in extension XFree86-DGA
    [ 4.225] Initializing built-in extension XFree86-DRI
    [ 4.225] Initializing built-in extension DRI2
    [ 4.225] (II) LoadModule: "glx"
    [ 4.238] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
    [ 4.299] (II) Module glx: vendor="NVIDIA Corporation"
    [ 4.299] compiled for 4.0.2, module version = 1.0.0
    [ 4.299] Module class: X.Org Server Extension
    [ 4.299] (II) NVIDIA GLX Module 331.20 Wed Oct 30 17:36:48 PDT 2013
    [ 4.300] Loading extension GLX
    [ 4.300] (II) LoadModule: "nvidia"
    [ 4.301] (II) Loading /usr/lib/xorg/modules/drivers/nvidia_drv.so
    [ 4.307] (II) Module nvidia: vendor="NVIDIA Corporation"
    [ 4.307] compiled for 4.0.2, module version = 1.0.0
    [ 4.307] Module class: X.Org Video Driver
    [ 4.309] (II) NVIDIA dlloader X Driver 331.20 Wed Oct 30 17:16:53 PDT 2013
    [ 4.309] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
    [ 4.309] (++) using VT number 1
    [ 4.309] (EE) No devices detected.
    [ 4.309] (EE)
    Fatal server error:
    [ 4.309] (EE) no screens found(EE)
    [ 4.309] (EE)
    Please consult the The X.Org Foundation support
    at [url]http://wiki.x.org[/url]
    for help.
    [ 4.309] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
    [ 4.309] (EE)
    Last edited by sjdh (2013-11-17 07:02:12)

    sjdh, please edit your post.
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    like this
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    One question before I bring my 'book in... if there's nothing wrong with my hard drive, and some other part needs to be replaced, will my hard drive end up being wiped? I understand it's probably standard procedure after a repair to start with a clean system - however I have tons of photos which I didn't back up, which I realize now is stupid, to say the least.
    If anyone has any further suggestions as to what I can do with an iBook that does nothing but run its fan... please let me know Otherwise, tomorrow I'll post what the issue was if I can get it looked at... hopefully not too many other people have experienced the same issues. Cross your fingers~!

  • G62 b05sd screen goes black after windows logo

    Hello,
    My laptop has been turning of at random lately and now the screen turns black after the windows logo appears, though the start-up tune can be heared. I've tried connecting it to different external monitors yet it doesn't work. I've been able to start-up in safe mode and tried updating BIOS using both HP support assistant as well as manually. HP sup. ass. also doesn't indicate updating anything. The battery is essantially dead, yet i've used the laptop for a long time using the adapter only. 
    My next step is to do a windows system recovery, but I want to see if the issue can be resolved differently.
    Thnx

    Hi @frankkilsdonk , 
    Thank you for visiting the HP Support Forums and Welcome. I have looked into your issue about your HP G62-b05SD Notebook and issues with freezing on the Windows logo. It is trying to load something . I would look at what is in your startup file in Windows.
    You can do a system restore. System restore will help if something automatically updated and did not go well on the Notebook. If you installed new software on the Notebook you might want to uninstall it as this could be the issue as well.
    When performing a System restore please note remove any and all USB devices. Disconnect all non-essential devices as they can cause issues.
    Thanks.
    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
    Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

  • Mac pro turns on but screen goes black after a while what could be wrong please help!!!

    Hello mac community, I am new,
    I updated a program today everything was working fine yesterday and now today I was updating PLAY a music engine program it seems to have caused the mac to go crazy. I also updated VE PRO 5 another music program. Everything has gone crazy. It turns on but then then the screen goes black after a while 5-10mins. I managed to get the crash report.
    Why is the graphics card all of a sudden effected by program updates.
    Sat Sep 28 10:49:06 2013
    panic(cpu 20 caller 0xffffff7f80f4775c): "ATICLASS::detectPowerDown: GPU is not found. PCI config access fails!!!\n"@/SourceCache/GraphicsDrivers/GraphicsDrivers-6.36.10/Common/IONDRV/ ATI/IOFramebuffer/ATIFramebuffer/Controller/Sources/R800/EvergreenClocks.cpp:825
    Backtrace (CPU 20), Frame : Return Address
    0xffffff83d2693a90 : 0xffffff8000204d15
    0xffffff83d2693b90 : 0xffffff7f80f4775c
    0xffffff83d2693bb0 : 0xffffff7f80f493dc
    0xffffff83d2693bd0 : 0xffffff7f8158cbe5
    0xffffff83d2693c00 : 0xffffff7f8158677c
    0xffffff83d2693c40 : 0xffffff7f80d9ac80
    0xffffff83d2693cc0 : 0xffffff7f80d99750
    0xffffff83d2693d00 : 0xffffff80005281dd
    0xffffff83d2693d70 : 0xffffff8000553deb
    0xffffff83d2693de0 : 0xffffff80002ba770
    0xffffff83d2693e50 : 0xffffff8000205536
    0xffffff83d2693e80 : 0xffffff80002029eb
    0xffffff83d2693ef0 : 0xffffff8000274176
    0xffffff83d2693f60 : 0xffffff80002c3095
    0xffffff83d2693fa0 : 0xffffff80002e4894
    Kernel Extensions in backtrace (with dependencies):
    com.apple.kext.ATIFramebuffer(6.3.6)@0xffffff7f81585000->0xffffff7f81598fff
                dependency: com.apple.iokit.IOACPIFamily(1.3.0)@0xffffff7f80800000
                dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0xffffff7f80804000
                dependency: com.apple.iokit.IOGraphicsFamily(2.2.1)@0xffffff7f80d88000
                dependency: com.apple.kext.ATISupport(6.3.6)@0xffffff7f80e02000
    com.apple.kext.ATI5000Controller(6.3.6)@0xffffff7f80f30000->0xffffff7f80f5afff
                dependency: com.apple.iokit.IOACPIFamily(1.3.0)@0xffffff7f80800000
                dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0xffffff7f80804000
                dependency: com.apple.iokit.IOGraphicsFamily(2.2.1)@0xffffff7f80d88000
                dependency: com.apple.kext.ATISupport(6.3.6)@0xffffff7f80e02000
    com.apple.iokit.IOGraphicsFamily(2.2.1)@0xffffff7f80d88000->0xffffff7f80daffff
                dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0xffffff7f80804000
    BSD process name corresponding to current thread: WindowServer
    Mac OS version:
    10K549
    Kernel version:
    Darwin Kernel Version 10.8.0: Tue Jun  7 16:32:41 PDT 2011; root:xnu-1504.15.3~1/RELEASE_X86_64
    System model name: MacPro5,1 (Mac-F221BEC8)
    System uptime in nanoseconds: 12612076511
    unloaded kexts:
    (none)
    loaded kexts:
    com.audinate.dante.driver.DanteVirtualSoundcard     0.9.3
    com.paceap.kext.pacesupport.snowleopard       5.8
    com.Areca.ArcMSR  1.3.3
    com.apple.filesystems.autofs    2.1.0
    com.apple.driver.AppleTyMCEDriver 1.0.2d2
    com.apple.driver.AGPM    100.12.31
    com.apple.driver.AppleHWSensor     1.9.3d0
    com.apple.driver.AudioAUUC    1.57
    com.apple.driver.AppleUpstreamUserClient       3.5.7
    com.apple.driver.AppleMCCSControl 1.0.20
    com.apple.driver.AppleMikeyHIDDriver      1.2.0
    com.apple.kext.ATIFramebuffer        6.3.6
    com.apple.driver.AppleIntelPenrynProfile   17
    com.apple.Dont_Steal_Mac_OS_X    7.0.0
    com.apple.driver.AppleMikeyDriver    2.0.5f14
    com.apple.ATIRadeonX3000     6.3.6
    com.apple.driver.AppleIntelNehalemProfile        11
    com.apple.driver.AppleHDA      2.0.5f14
    com.apple.driver.AudioIPCDriver       1.1.6
    com.apple.driver.AirPortBrcm43xx     423.91.27
    com.apple.driver.Intel82574L    2.1.8b1
    com.apple.driver.AppleIntelMeromProfile   19
    com.apple.driver.AirPortBrcm43224  428.42.4
    com.apple.driver.ACPI_SMC_PlatformPlugin     4.7.0a1
    com.apple.driver.AppleLPC       1.5.1
    com.apple.driver.AppleIntel8254XEthernet 2.1.3b1
    com.apple.filesystems.ntfs        3.4
    com.apple.iokit.SCSITaskUserClient  2.6.8
    com.apple.iokit.IOAHCIBlockStorage 1.6.4
    com.apple.driver.AppleUSBHub 4.2.4
    com.apple.driver.AppleFWOHCI        4.7.3
    com.apple.driver.AppleUSBEHCI       4.2.4
    com.apple.BootCache       31.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
    com.apple.driver.AppleAHCIPort       2.1.7
    com.apple.driver.AppleUSBUHCI       4.2.0
    com.apple.driver.AppleEFINVRAM    1.4.0
    com.apple.driver.AppleRTC       1.3.1
    com.apple.driver.AppleHPET     1.5
    com.apple.driver.AppleACPIButtons  1.3.6
    com.apple.driver.AppleSMBIOS        1.7
    com.apple.driver.AppleACPIEC 1.3.6
    com.apple.driver.AppleAPIC      1.4
    com.apple.driver.AppleIntelCPUPowerManagementClient  142.6.0
    com.apple.security.sandbox      1
    com.apple.security.quarantine   0
    com.apple.nke.applicationfirewall       2.1.14
    com.apple.driver.AppleIntelCPUPowerManagement   142.6.0
    com.apple.iokit.IOSCSIBlockCommandsDevice 2.6.8 - last loaded 12365095188
    com.apple.driver.AppleProfileReadCounterAction       17
    com.apple.driver.AppleProfileTimestampAction  10
    com.apple.driver.AppleProfileThreadInfoAction  14
    com.apple.driver.AppleProfileRegisterStateAction      10
    com.apple.driver.AppleProfileKEventAction        10
    com.apple.driver.AppleProfileCallstackAction     20
    com.apple.iokit.IOSurface 74.2
    com.apple.iokit.IOBluetoothSerialManager 2.4.5f3
    com.apple.iokit.IOSerialFamily  10.0.3
    com.apple.driver.AppleHDAHardwareConfigDriver     2.0.5f14
    com.apple.driver.DspFuncLib    2.0.5f14
    com.apple.iokit.IONDRVSupport        2.2.1
    com.apple.iokit.IOAudioFamily  1.8.3fc2
    com.apple.kext.OSvKernDSPLib       1.3
    com.apple.driver.AppleSMBusController    1.0.10d0
    com.apple.iokit.IOFireWireIP     2.0.3
    com.apple.kext.ATI5000Controller     6.3.6
    com.apple.kext.ATISupport       6.3.6
    com.apple.iokit.AppleProfileFamily     41
    com.apple.driver.AppleHDAController        2.0.5f14
    com.apple.iokit.IOGraphicsFamily     2.2.1
    com.apple.iokit.IOHDAFamily    2.0.5f14
    com.apple.iokit.IO80211Family  320.1
    com.apple.driver.AppleSMC      3.1.0d5
    com.apple.driver.IOPlatformPluginFamily   4.7.0a1
    com.apple.driver.AppleSMBusPCI     1.0.10d0
    com.apple.iokit.IONetworkingFamily  1.10
    com.apple.driver.BroadcomUSBBluetoothHCIController     2.4.5f3
    com.apple.driver.AppleUSBBluetoothHCIController    2.4.5f3
    com.apple.iokit.IOBluetoothFamily     2.4.5f3
    com.apple.driver.AppleUSBMergeNub       4.2.4
    com.apple.driver.AppleUSBComposite       3.9.0
    com.apple.driver.XsanFilter       402.1
    com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.6.8
    com.apple.iokit.IOBDStorageFamily   1.6
    com.apple.iokit.IODVDStorageFamily        1.6
    com.apple.iokit.IOCDStorageFamily  1.6.1
    com.apple.iokit.IOUSBUserClient      4.2.4
    com.apple.iokit.IOAHCISerialATAPI   1.2.6
    com.apple.iokit.IOFireWireFamily      4.2.6
    com.apple.driver.AppleFileSystemDriver    2.0
    com.apple.iokit.IOAHCIFamily   2.0.6
    com.apple.iokit.IOUSBFamily    4.2.4
    com.apple.iokit.IOSCSIParallelFamily        2.1.1
    com.apple.iokit.IOSCSIArchitectureModelFamily        2.6.8
    com.apple.driver.AppleEFIRuntime    1.4.0
    com.apple.iokit.IOHIDFamily     1.6.6
    com.apple.iokit.IOSMBusFamily        1.1
    com.apple.security.TMSafetyNet       6
    com.apple.kext.AppleMatch      1.0.0d1
    com.apple.driver.DiskImages    289
    com.apple.iokit.IOStorageFamily       1.6.3
    com.apple.driver.AppleACPIPlatform 1.3.6
    com.apple.iokit.IOPCIFamily     2.6.5
    com.apple.iokit.IOACPIFamily   1.3.0
    Cubase has this error
    Process:         Cubase 6 [222]
    Path:            /Applications/Cubase 6.app/Contents/MacOS/Cubase 6
    Identifier:      com.steinberg.cubase
    Version:         6.0.7.364 (6.0.7.364)
    Code Type:       X86-64 (Native)
    Parent Process:  launchd [144]
    Date/Time:       2013-09-28 10:50:35.845 +0100
    OS Version:      Mac OS X 10.6.8 (10K549)
    Report Version:  6
    Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
    Exception Codes: KERN_INVALID_ADDRESS at 0x000000012473fd9f
    Crashed Thread:  0  Dispatch queue: com.apple.main-thread
    Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
    0   ???                             0x000000012473fd9f 0 + 4906548639
    1   dyld                             0x00007fff5fc0c839 ImageLoader::link(ImageLoader::LinkContext const&, bool, bool, ImageLoader::RPathChain const&) + 201
    2   dyld                             0x00007fff5fc04d48 dyld::link(ImageLoader*, bool, ImageLoader::RPathChain const&) + 118
    3   dyld                             0x00007fff5fc08f68 dlopen + 490
    4   libSystem.B.dylib                 0x00007fff87a9be40 dlopen + 61
    5   com.apple.CoreFoundation          0x00007fff8223eef7 _CFBundleDlfcnLoadBundle + 231
    6   com.apple.CoreFoundation          0x00007fff8223de97 _CFBundleLoadExecutableAndReturnError + 1191
    7   com.apple.CoreFoundation          0x00007fff822cb30e CFBundleLoadExecutableAndReturnError + 14
    8   com.steinberg.cubase                  0x00000001011e8e55 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 69941
    9   com.steinberg.cubase                  0x00000001011e93f0 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 71376
    10  com.steinberg.cubase                 0x0000000100402690 0x100000000 + 4204176
    11  com.steinberg.cubase                 0x00000001011d8e77 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 4439
    12  com.steinberg.cubase                 0x00000001011e86b7 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 67991
    13  com.steinberg.cubase                 0x00000001011e892e CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 68622
    14  com.steinberg.cubase                 0x00000001011e8a64 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 68932
    15  com.steinberg.cubase                 0x00000001007c68ab 0x100000000 + 8153259
    16  com.steinberg.cubase                 0x0000000100d149c0 0x100000000 + 13715904
    17  com.steinberg.cubase                 0x0000000101277b99 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 654969
    18  com.steinberg.cubase                 0x0000000100d16dbd 0x100000000 + 13725117
    19  com.steinberg.cubase                 0x000000010116b048 0x100000000 + 18264136
    20  com.steinberg.cubase                 0x00000001000d39c4 0x100000000 + 866756
    Thread 1:  Dispatch queue: com.apple.libdispatch-manager
    0   libSystem.B.dylib                 0x00007fff87aaec0a kevent + 10
    1   libSystem.B.dylib                 0x00007fff87ab0add _dispatch_mgr_invoke + 154
    2   libSystem.B.dylib                 0x00007fff87ab07b4 _dispatch_queue_invoke + 185
    3   libSystem.B.dylib                 0x00007fff87ab02de _dispatch_worker_thread2 + 252
    4   libSystem.B.dylib                 0x00007fff87aafc08 _pthread_wqthread + 353
    5   libSystem.B.dylib                 0x00007fff87aafaa5 start_wqthread + 13
    Thread 2:
    0   libSystem.B.dylib                 0x00007fff87aafa2a __workq_kernreturn + 10
    1   libSystem.B.dylib                 0x00007fff87aafe3c _pthread_wqthread + 917
    2   libSystem.B.dylib                 0x00007fff87aafaa5 start_wqthread + 13
    Thread 3:  FThread
    0   libSystem.B.dylib                 0x00007fff87a95dce semaphore_timedwait_trap + 10
    1   com.steinberg.cubase                  0x00000001014f8437 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 3278615
    2   com.steinberg.cubase                  0x00000001007c8be0 0x100000000 + 8162272
    3   com.steinberg.cubase                  0x00000001014f8eb0 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 3281296
    4   libSystem.B.dylib                 0x00007fff87b7129a _pthread_body + 24
    Thread 4:
    0   libSystem.B.dylib                 0x00007fff87aafa2a __workq_kernreturn + 10
    1   libSystem.B.dylib                 0x00007fff87aafe3c _pthread_wqthread + 917
    2   libSystem.B.dylib                 0x00007fff87aafaa5 start_wqthread + 13
    Thread 5:
    0   libSystem.B.dylib                 0x00007fff87a95dda semaphore_timedwait_signal_trap + 10
    1   libSystem.B.dylib                 0x00007fff87ad4772 _pthread_cond_wait + 1015
    2   com.apple.CoreVideo                   0x00007fff82fbade6 CVDisplayLink::waitUntil(unsigned long long) + 252
    3   com.apple.CoreVideo                   0x00007fff82fba2a2 CVDisplayLink::runIOThread() + 644
    4   com.apple.CoreVideo                   0x00007fff82fb9fe3 startIOThread(void*) + 139
    5   libSystem.B.dylib                 0x00007fff87acefd6 _pthread_start + 331
    6   libSystem.B.dylib                 0x00007fff87acee89 thread_start + 13
    Thread 6:
    0   libSystem.B.dylib                 0x00007fff87aafa2a __workq_kernreturn + 10
    1   libSystem.B.dylib                 0x00007fff87aafe3c _pthread_wqthread + 917
    2   libSystem.B.dylib                 0x00007fff87aafaa5 start_wqthread + 13
    Thread 0 crashed with X86 Thread State (64-bit):
      rax: 0x00000001211f4000  rbx: 0x00007fff5fc43ae8  rcx: 0x00007fff5fc019df  rdx: 0x00007fff5fbfdd20
      rdi: 0x00000001211f4000  rsi: 0x00000001211f4000  rbp: 0x00007fff5fbfe170  rsp: 0x00007fff5fbfdce8
       r8: 0x0000000000000000   r9: 0x00007fff8abcf420  r10: 0x0000000000000000  r11: 0x00007fff8abcf420
      r12: 0x00000001224521e0  r13: 0x00000001211f4000  r14: 0x000000012473fd9f  r15: 0x00007fff5fbfdcf0
      rip: 0x000000012473fd9f  rfl: 0x0000000000010212  cr2: 0x000000012473fd9f
    Binary Images:
           0x100000000 -        0x1022a4fe7 +com.steinberg.cubase 6.0.7.364 (6.0.7.364) <CFFF5ABF-970D-896D-4A88-78FFF87878C1> /Applications/Cubase 6.app/Contents/MacOS/Cubase 6
           0x10268c000 -        0x1026dcff7  com.apple.audio.midi.CoreMIDI 1.7.1 (42) <E7DBCE93-A637-ABA2-B623-6A76B82EE243> /System/Library/Frameworks/CoreMIDI.framework/Versions/A/CoreMIDI
           0x102704000 -        0x10270aff7  com.apple.agl 3.0.12 (AGL-3.0.12) <014CA38F-CB49-8214-4C16-DF73FC6EFCE1> /System/Library/Frameworks/AGL.framework/Versions/A/AGL
           0x105f00000 -        0x105f89ff2 +com.eLicenser.POSAccess-DLL ??? (1.12.1.0) <66A02345-5109-F38C-1262-D00D8189324C> /Library/Application Support/eLicenser/pos/Synsoacc.bundle/Contents/MacOS/Synsoacc
           0x1170a6000 -        0x1170ccfff  GLRendererFloat ??? (???) <38621D22-8F49-F937-851B-E21BD49A8A88> /System/Library/Frameworks/OpenGL.framework/Resources/GLRendererFloat.bundle/GL RendererFloat
           0x11a17a000 -        0x11a30dfe7  GLEngine ??? (???) <BCE83654-81EC-D231-ED6E-1DD449B891F2> /System/Library/Frameworks/OpenGL.framework/Resources/GLEngine.bundle/GLEngine
           0x11a33e000 -        0x11a730fff  com.apple.ATIRadeonX3000GLDriver 1.6.36 (6.3.6) <282E53E2-ABB3-B97D-F298-6A8FE21F3A5A> /System/Library/Extensions/ATIRadeonX3000GLDriver.bundle/Contents/MacOS/ATIRade onX3000GLDriver
           0x11b243000 -        0x11b249fe7  libFontStreams.A.dylib 545.0.0 (compatibility 64.0.0) <87272933-FB21-81D0-00E6-92BC3D7583FB> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreGraphics.framework/Versions/A/Resources/libFontStreams.A.dylib
           0x1211f4000 -        0x121303fff +com.steinberg.omffilter 4.0.0.179 (4.0.0.179) <C05588E9-6173-ECEF-2BF1-92AE05B78913> /Applications/Cubase 6.app/Contents/Components/omffilter.bundle/Contents/MacOS/omffilter
        0x7fff5fc00000 -     0x7fff5fc3bdef  dyld 132.1 (???) <69130DA3-7CB3-54C8-ABC5-423DECDD2AF7> /usr/lib/dyld
        0x7fff80003000 -     0x7fff80059fe7  libTIFF.dylib ??? (???) <2DBEC120-DAA7-3789-36A2-A205BCDF2D72> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ImageIO.framework/Versions/A/Resources/libTIFF.dylib
        0x7fff8008f000 -     0x7fff8011ffff  com.apple.SearchKit 1.3.0 (1.3.0) <4175DC31-1506-228A-08FD-C704AC9DF642> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/SearchK it.framework/Versions/A/SearchKit
        0x7fff80132000 -     0x7fff80179ff7  com.apple.coreui 2 (114) <923E33CC-83FC-7D35-5603-FB8F348EE34B> /System/Library/PrivateFrameworks/CoreUI.framework/Versions/A/CoreUI
        0x7fff80453000 -     0x7fff8048dfff  libcups.2.dylib 2.8.0 (compatibility 2.0.0) <4F2A4397-89BD-DEAC-4971-EE838FFA0964> /usr/lib/libcups.2.dylib
        0x7fff80c2c000 -     0x7fff81626ff7  com.apple.AppKit 6.6.8 (1038.36) <4CFBE04C-8FB3-B0EA-8DDB-7E7D10E9D251> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
        0x7fff81627000 -     0x7fff816dcfe7  com.apple.ink.framework 1.3.3 (107) <8C36373C-5473-3A6A-4972-BC29D504250F> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Ink.framework /Versions/A/Ink
        0x7fff8189e000 -     0x7fff81938fff  com.apple.ApplicationServices.ATS 275.19 (???) <2DE8987F-4563-4D8E-45C3-2F6F786E120D> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ATS.framework/Versions/A/ATS
        0x7fff8199c000 -     0x7fff81c1efff  com.apple.Foundation 6.6.8 (751.63) <E10E4DB4-9D5E-54A8-3FB6-2A82426066E4> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
        0x7fff81c1f000 -     0x7fff81c1fff7  com.apple.Carbon 150 (152) <C0E61968-57F3-6EE1-8524-32A18955BAF0> /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon
        0x7fff81c20000 -     0x7fff81c26ff7  com.apple.CommerceCore 1.0 (9.1) <3691E9BA-BCF4-98C7-EFEC-78DA6825004E> /System/Library/PrivateFrameworks/CommerceKit.framework/Versions/A/Frameworks/C ommerceCore.framework/Versions/A/CommerceCore
        0x7fff81c7f000 -     0x7fff81c8cfe7  libCSync.A.dylib 545.0.0 (compatibility 64.0.0) <1C35FA50-9C70-48DC-9E8D-2054F7A266B1> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreGraphics.framework/Versions/A/Resources/libCSync.A.dylib
        0x7fff81c8d000 -     0x7fff82196ff7  com.apple.RawCamera.bundle 3.14.0 (646) <75A96BFC-1832-808B-F430-C4C9379C5A98> /System/Library/CoreServices/RawCamera.bundle/Contents/MacOS/RawCamera
        0x7fff82197000 -     0x7fff821ecff7  com.apple.framework.familycontrols 2.0.2 (2020) <F09541B6-5E28-1C01-C1AE-F6A2508670C7> /System/Library/PrivateFrameworks/FamilyControls.framework/Versions/A/FamilyCon trols
        0x7fff821ed000 -     0x7fff821f1ff7  libCGXType.A.dylib 545.0.0 (compatibility 64.0.0) <DB710299-B4D9-3714-66F7-5D2964DE585B> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreGraphics.framework/Versions/A/Resources/libCGXType.A.dylib
        0x7fff821f4000 -     0x7fff8236bfe7  com.apple.CoreFoundation 6.6.6 (550.44) <BB4E5158-E47A-39D3-2561-96CB49FA82D4> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
        0x7fff823b7000 -     0x7fff82482fff  ColorSyncDeprecated.dylib 4.6.0 (compatibility 1.0.0) <86982FBB-B224-CBDA-A9AD-8EE97BDB8681> /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ColorSync.f ramework/Versions/A/Resources/ColorSyncDeprecated.dylib
        0x7fff82483000 -     0x7fff824c1fe7  libFontRegistry.dylib ??? (???) <395D7C0D-36B5-B353-0DC8-51ABC0B1C030> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ATS.framework/Versions/A/Resources/libFontRegistry.dylib
        0x7fff824c2000 -     0x7fff82681fff  com.apple.ImageIO.framework 3.0.6 (3.0.6) <92882FD3-CB3F-D0BE-DDDA-43B4BEE10F58> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ImageIO.framework/Versions/A/ImageIO
        0x7fff82682000 -     0x7fff82686ff7  libmathCommon.A.dylib 315.0.0 (compatibility 1.0.0) <95718673-FEEE-B6ED-B127-BCDBDB60D4E5> /usr/lib/system/libmathCommon.A.dylib
        0x7fff82687000 -     0x7fff82687ff7  com.apple.Accelerate 1.6 (Accelerate 1.6) <15DF8B4A-96B2-CB4E-368D-DEC7DF6B62BB> /System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate
        0x7fff82688000 -     0x7fff82745fff  com.apple.CoreServices.OSServices 359.2 (359.2) <BBB8888E-18DE-5D09-3C3A-F4C029EC7886> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/OSServi ces.framework/Versions/A/OSServices
        0x7fff82746000 -     0x7fff82747ff7  com.apple.audio.units.AudioUnit 1.6.7 (1.6.7) <49B723D1-85F8-F86C-2331-F586C56D68AF> /System/Library/Frameworks/AudioUnit.framework/Versions/A/AudioUnit
        0x7fff827c6000 -     0x7fff827d7ff7  libz.1.dylib 1.2.3 (compatibility 1.0.0) <97019C74-161A-3488-41EC-A6CA8738418C> /usr/lib/libz.1.dylib
        0x7fff827d8000 -     0x7fff82842fe7  libvMisc.dylib 268.0.1 (compatibility 1.0.0) <AF0EA96D-000F-8C12-B952-CB7E00566E08> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.fr amework/Versions/A/libvMisc.dylib
        0x7fff82843000 -     0x7fff82959ff7  libxml2.2.dylib 10.3.0 (compatibility 10.0.0) <3814FCF9-92B9-A6AB-E76A-F7021894AA3F> /usr/lib/libxml2.2.dylib
        0x7fff82cad000 -     0x7fff82ccdfff  com.apple.DirectoryService.Framework 3.6 (621.16) <0ED4A74A-F8FB-366D-6588-F13EA397326F> /System/Library/Frameworks/DirectoryService.framework/Versions/A/DirectoryServi ce
        0x7fff82da6000 -     0x7fff82e24ff7  com.apple.CoreText 151.13 (???) <5C6214AD-D683-80A8-86EB-328C99B75322> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreText.framework/Versions/A/CoreText
        0x7fff82e25000 -     0x7fff82f5afff  com.apple.audio.toolbox.AudioToolbox 1.6.7 (1.6.7) <F4814A13-E557-59AF-30FF-E62929367933> /System/Library/Frameworks/AudioToolbox.framework/Versions/A/AudioToolbox
        0x7fff82fb5000 -     0x7fff82fb7fff  com.apple.print.framework.Print 6.1 (237.1) <CA8564FB-B366-7413-B12E-9892DA3C6157> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Print.framewo rk/Versions/A/Print
        0x7fff82fb8000 -     0x7fff82fddff7  com.apple.CoreVideo 1.6.2 (45.6) <E138C8E7-3CB6-55A9-0A2C-B73FE63EA288> /System/Library/Frameworks/CoreVideo.framework/Versions/A/CoreVideo
        0x7fff82fde000 -     0x7fff8311cfff  com.apple.CoreData 102.1 (251) <9DFE798D-AA52-6A9A-924A-DA73CB94D81A> /System/Library/Frameworks/CoreData.framework/Versions/A/CoreData
        0x7fff8311d000 -     0x7fff831cdfff  edu.mit.Kerberos 6.5.11 (6.5.11) <085D80F5-C9DC-E252-C21B-03295E660C91> /System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos
        0x7fff831ce000 -     0x7fff8328ffef  com.apple.ColorSync 4.6.8 (4.6.8) <7DF1D175-6451-51A2-DBBF-40FCA78C0D2C> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ColorSync.framework/Versions/A/ColorSync
        0x7fff832c0000 -     0x7fff8339dfff  com.apple.vImage 4.1 (4.1) <C3F44AA9-6F71-0684-2686-D3BBC903F020> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.fr amework/Versions/A/vImage
        0x7fff8339e000 -     0x7fff8339eff7  com.apple.vecLib 3.6 (vecLib 3.6) <96FB6BAD-5568-C4E0-6FA7-02791A58B584> /System/Library/Frameworks/vecLib.framework/Versions/A/vecLib
        0x7fff8339f000 -     0x7fff8369dfff  com.apple.HIToolbox 1.6.5 (???) <AD1C18F6-51CB-7E39-35DD-F16B1EB978A8> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.fra mework/Versions/A/HIToolbox
        0x7fff8369e000 -     0x7fff836c0ff7  libexpat.1.dylib 7.2.0 (compatibility 7.0.0) <8EC31253-B585-D05E-F35D-AE3292FB790B> /usr/lib/libexpat.1.dylib
        0x7fff83722000 -     0x7fff8376bfef  libGLU.dylib ??? (???) <B0F4CA55-445F-E901-0FCF-47B3B4BAE6E2> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLU.dylib
        0x7fff8376c000 -     0x7fff83851fef  com.apple.DesktopServices 1.5.11 (1.5.11) <39FAA3D2-6863-B5AB-AED9-92D878EA2438> /System/Library/PrivateFrameworks/DesktopServicesPriv.framework/Versions/A/Desk topServicesPriv
        0x7fff8389f000 -     0x7fff838e2ff7  libRIP.A.dylib 545.0.0 (compatibility 64.0.0) <5FF3D7FD-84D8-C5FA-D640-90BB82EC651D> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreGraphics.framework/Versions/A/Resources/libRIP.A.dylib
        0x7fff83904000 -     0x7fff83904ff7  com.apple.ApplicationServices 38 (38) <10A0B9E9-4988-03D4-FC56-DDE231A02C63> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Application Services
        0x7fff83914000 -     0x7fff83af6fef  libType1Scaler.dylib ??? (???) <7892C4D7-3E5E-D7DA-AA4E-8D4ACED143D9> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ATS.framework/Versions/A/Resources/libType1Scaler.dylib

    I havent had the exact same problem as you but I am having a similar problem where lately I noticed when working in Pro Tools (mainly because I use my mac pro for audio work) or even when on the internet whatever it may be that my screen has been flickering a little bit or gets slightly glitchy.
    Yesterday upon startup for the first time the screen went black. Had to do a force shutdown. Unplugged all external devices. Reset everything as well. Slowly checked everything was on the phone with Apple even during the process. Seemed to correct the issue. Then of course I get off the phone, restarted my computer and it goes black randomly again.
    Rebooted fine. Checked all my hard disks internal and external, verified and repaired permissions on main drive and clone. Since then nothing yet...But I still feel its either the Video Card or the Monitor as everything else is fully operational.
    I plan on taking it in to look at as my applecare is up in November but I cant point my finger on it. And really am trying to avoid lugging the mac pro and monitor in at the same time...(Not the easiest thing with lack of parking in nyc..)
    If the display was dying I feel like it would have konked out already.
    The funny thing is I have had to replace video cards and monitors in the past but this time I cant quite figure out what the **** is going on.
    I am leaning towards the video card as I noticed it flickered a little when opening plug in windows in pro tools or multiple windows in sfari but it doesnt make sense.
    Worst part is I cant do a hardware test cause for some reason this computer doesnt have the software installed. It does nothing when I hold down the D button...
    I  totally baffled but the randomness of this.

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