Screen goes black...why?

Over the past couple of days, my screen has suddenly gone black, and the little green light on the monitor flashes. A re-start with the power button is then required. I've also noticed my Mac running more slowly than usual, with rather more spinning tops than usual, and the broad-band is slow as well. Apart from the hot weather, recently uplifted RAM, there are no other clues.
This is a bit worrying - any thoughts out there?
Many thanks!
Jobetim

Heat, dust, data corruption, fans not running high enough, and circuit is shared with or being overloaded, for starters, run Apple First Aid to repair your drives, follow up with Alsoft Disk Warrior, and please clone your boot drive and try using that.

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                dependency: com.apple.iokit.IOACPIFamily(1.3.0)@0xffffff7f80800000
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                dependency: com.apple.kext.ATISupport(6.3.6)@0xffffff7f80e02000
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                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
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    10K549
    Kernel version:
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    System model name: MacPro5,1 (Mac-F221BEC8)
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    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
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    Identifier:      com.steinberg.cubase
    Version:         6.0.7.364 (6.0.7.364)
    Code Type:       X86-64 (Native)
    Parent Process:  launchd [144]
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    Report Version:  6
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    7   com.apple.CoreFoundation          0x00007fff822cb30e CFBundleLoadExecutableAndReturnError + 14
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    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
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      rdi: 0x00000001211f4000  rsi: 0x00000001211f4000  rbp: 0x00007fff5fbfe170  rsp: 0x00007fff5fbfdce8
       r8: 0x0000000000000000   r9: 0x00007fff8abcf420  r10: 0x0000000000000000  r11: 0x00007fff8abcf420
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           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
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