My iMac (Mid-2011) Screen Goes Black

I had a little trouble recently with my 27" mid-2011 iMac getting green vertical bars on the grey loading screen, and took it in to my local Apple store for a repair. They initially said it was the LCD panel, but upon picking up the 'repaired' product, was told they had just replaced the video card.
Now, after getting it home (yesterday, May 16th), it took all of an hour before the screen starting going black. The music is still playing, and I can control it with my keyboard, so the actual system is running.
I've tried the usual (safe booting, PRAM reset) but all that happens is it'll sort itself out for a few minutes before going back to black.
My Applecare coverage literally ran out days after I took it in for service, and it's unlikely I'll be able to get it back to the store for a repair, which was one of the reasons I was so close to the end of my coverage when I did make it down.
Do Apple do UK home visits? And what are my options? Is my iMac still covered as this repair has not left me without problems?

Hi...
Have you tried an SMC reset >>> Resetting the System Management Controller (SMC)

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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
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    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.

My iMac (Mid-2011) Screen Goes Black

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