Quad Core Mac Tower keeps switching off!!!

Hi, my Quad Core Mac Tower keeps switching off!!! I start the computer up on start up half way through the process it switches off I have had this quad core for quite a few years with no problems until now. Can anyone help please

Then
Boot to recovery and repair the HD via Disk Utility
OS X: About OS X Recovery - Apple Support
Resinstall the OS. If you follow the following nothing should be lost
OS X Yosemite: Reinstall OS X

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    Anonymous UUID:       727231A4-307D-84F0-6914-8EE94F89D815
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    panic(cpu 0 caller 0xffffff7f9ef9af7c): "GPU Panic: [<None>] 5 3 7f 0 0 0 0 3 : NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xc0000000 0xffffff80c45a5000 0x0a5480a2, D0, P3/4\n"@/SourceCache/AppleGraphicsControl/AppleGraphicsControl-3.5.26/src/Apple MuxControl/kext/GPUPanic.cpp:127
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    0xffffff80b328b1c0 : 0xffffff7f9ef9af7c
    0xffffff80b328b290 : 0xffffff7f9d625e7b
    0xffffff80b328b350 : 0xffffff7f9d6ef46a
    0xffffff80b328b390 : 0xffffff7f9d6ef4da
    0xffffff80b328b400 : 0xffffff7f9d96e056
    0xffffff80b328b530 : 0xffffff7f9d712b09
    0xffffff80b328b550 : 0xffffff7f9d62c8cd
    0xffffff80b328b600 : 0xffffff7f9d62a3d8
    0xffffff80b328b800 : 0xffffff7f9d62b356
    0xffffff80b328b8e0 : 0xffffff7f9e5ae9c2
    0xffffff80b328b920 : 0xffffff7f9e5be37f
    0xffffff80b328b940 : 0xffffff7f9e5ec33b
    0xffffff80b328b980 : 0xffffff7f9e5ec39b
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    0xffffff80b328ba10 : 0xffffff7f9e58fb5e
    0xffffff80b328baa0 : 0xffffff7f9e58bae7
    0xffffff80b328bad0 : 0xffffff7f9e589636
    0xffffff80b328bb00 : 0xffffff801d0ce0a3
    0xffffff80b328bb90 : 0xffffff801d0cff9f
    0xffffff80b328bbf0 : 0xffffff801d0cdabf
    0xffffff80b328bd40 : 0xffffff801ccb66a8
    0xffffff80b328be50 : 0xffffff801cc26bf1
    0xffffff80b328be80 : 0xffffff801cc139f5
    0xffffff80b328bef0 : 0xffffff801cc1e043
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          Kernel Extensions in backtrace:
             com.apple.driver.AppleMuxControl(3.5.26)[B67CD59F-1344-37BC-8A9A-46D6D3DCA13D]@ 0xffffff7f9ef8c000->0xffffff7f9ef9ffff
                dependency: com.apple.driver.AppleGraphicsControl(3.5.26)[C0F9A79F-167E-3A68-873C-5CE17B97F B11]@0xffffff7f9ef84000
                dependency: com.apple.iokit.IOACPIFamily(1.4)[045D5D6F-AD1E-36DB-A249-A346E2B48E54]@0xfffff f7f9d52b000
                dependency: com.apple.iokit.IOPCIFamily(2.9)[244D4E48-78E6-3369-8D76-285C66EF9BF4]@0xffffff 7f9d2be000
                dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[B889D3AB-CCC0-3FCD-A83E-D2E3E4CB537B]@0 xffffff7f9d583000
                dependency: com.apple.driver.AppleBacklightExpert(1.0.4)[E04639C5-D734-3AB3-A682-FE66694C66 53]@0xffffff7f9ef87000
             com.apple.nvidia.classic.NVDAResmanTesla(8.2.4)[6EB3FF52-A4F6-3496-AE9C-D89B00F DE504]@0xffffff7f9d5d6000->0xffffff7f9d83efff
                dependency: com.apple.iokit.IOPCIFamily(2.9)[244D4E48-78E6-3369-8D76-285C66EF9BF4]@0xffffff 7f9d2be000
                dependency: com.apple.iokit.IONDRVSupport(2.4.1)[B93BBFC9-9ED5-3DDD-8CED-5EDA081BB997]@0xff ffff7f9d5c6000
                dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[B889D3AB-CCC0-3FCD-A83E-D2E3E4CB537B]@0 xffffff7f9d583000
             com.apple.GeForceTesla(8.2.4)[24ED915E-02F3-3A31-8502-6AA41FFCA420]@0xffffff7f9 e56e000->0xffffff7f9e638fff
                dependency: com.apple.iokit.IOPCIFamily(2.9)[244D4E48-78E6-3369-8D76-285C66EF9BF4]@0xffffff 7f9d2be000
                dependency: com.apple.iokit.IONDRVSupport(2.4.1)[B93BBFC9-9ED5-3DDD-8CED-5EDA081BB997]@0xff ffff7f9d5c6000
                dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[B889D3AB-CCC0-3FCD-A83E-D2E3E4CB537B]@0 xffffff7f9d583000
                dependency: com.apple.nvidia.classic.NVDAResmanTesla(8.2.4)[6EB3FF52-A4F6-3496-AE9C-D89B00F DE504]@0xffffff7f9d5d6000
             com.apple.nvidia.classic.NVDANV50HalTesla(8.2.4)[B0E6AAA7-E970-3D81-8B43-145D56 A3A4AC]@0xffffff7f9d849000->0xffffff7f9daf2fff
                dependency: com.apple.nvidia.classic.NVDAResmanTesla(8.2.4)[6EB3FF52-A4F6-3496-AE9C-D89B00F DE504]@0xffffff7f9d5d6000
                dependency: com.apple.iokit.IOPCIFamily(2.9)[244D4E48-78E6-3369-8D76-285C66EF9BF4]@0xffffff 7f9d2be000
    BSD process name corresponding to current thread: WindowServer
    Mac OS version:
    13D65
    Kernel version:
    Darwin Kernel Version 13.2.0: Thu Apr 17 23:03:13 PDT 2014; root:xnu-2422.100.13~1/RELEASE_X86_64
    Kernel UUID: ADD73AE6-88B0-32FB-A8BB-4F7C8BE4092E
    Kernel slide:     0x000000001ca00000
    Kernel text base: 0xffffff801cc00000
    System model name: MacBookPro6,2 (Mac-F22586C8)
    System uptime in nanoseconds: 192974850507
    last loaded kext at 28847231808: com.apple.driver.AudioAUUC          1.60 (addr 0xffffff7f9e7d6000, size 32768)
    loaded kexts:
    com.apple.driver.AudioAUUC          1.60
    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.driver.AppleTyMCEDriver          1.0.2d2
    com.apple.driver.AGPM          100.14.15
    com.apple.filesystems.autofs          3.0
    com.apple.iokit.IOBluetoothSerialManager          4.2.4f1
    com.apple.driver.AppleMikeyHIDDriver          124
    com.apple.driver.AppleHDAHardwareConfigDriver          2.6.1f2
    com.apple.driver.AppleMikeyDriver          2.6.1f2
    com.apple.driver.AppleHDA          2.6.1f2
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AppleUpstreamUserClient          3.5.13
    com.apple.driver.AppleIntelHDGraphics          8.2.4
    com.apple.driver.AppleHWAccess          1
    com.apple.GeForceTesla          8.2.4
    com.apple.driver.AppleBacklight          170.3.5
    com.apple.driver.AppleMCCSControl          1.1.12
    com.apple.iokit.IOBluetoothUSBDFU          4.2.4f1
    com.apple.driver.AppleMuxControl          3.5.26
    com.apple.driver.AppleLPC          1.7.0
    com.apple.driver.AppleIntelMCEReporter          104
    com.apple.driver.AppleIntelHDGraphicsFB          8.2.4
    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport          4.2.4f1
    com.apple.driver.AppleSMCLMU          2.0.4d1
    com.apple.nvidia.NVDAStartup          8.2.6
    com.apple.driver.AppleSMCPDRC          1.0.0
    com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
    com.apple.driver.SMCMotionSensor          3.0.4d1
    com.apple.driver.AppleUSBTCButtons          240.2
    com.apple.driver.AppleUSBCardReader          3.4.1
    com.apple.driver.AppleIRController          325.7
    com.apple.driver.AppleFileSystemDriver          3.0.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          35
    com.apple.driver.AppleUSBTCKeyEventDriver          240.2
    com.apple.driver.AppleUSBTCKeyboard          240.2
    com.apple.iokit.SCSITaskUserClient          3.6.6
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCIBlockStorage          2.5.1
    com.apple.driver.AppleUSBHub          666.4.0
    com.apple.driver.AppleFWOHCI          5.0.2
    com.apple.iokit.AppleBCM5701Ethernet          3.8.1b2
    com.apple.driver.AppleUSBUHCI          656.4.1
    com.apple.driver.AppleAHCIPort          3.0.0
    com.apple.driver.AirPort.Brcm4331          700.20.22
    com.apple.driver.AppleUSBEHCI          660.4.0
    com.apple.driver.AppleSmartBatteryManager          161.0.0
    com.apple.driver.AppleRTC          2.0
    com.apple.driver.AppleACPIButtons          2.0
    com.apple.driver.AppleHPET          1.8
    com.apple.driver.AppleSMBIOS          2.1
    com.apple.driver.AppleACPIEC          2.0
    com.apple.driver.AppleAPIC          1.7
    com.apple.driver.AppleIntelCPUPowerManagementClient          217.92.1
    com.apple.nke.applicationfirewall          153
    com.apple.security.quarantine          3
    com.apple.driver.AppleIntelCPUPowerManagement          217.92.1
    com.apple.AppleGraphicsDeviceControl          3.5.26
    com.apple.kext.triggers          1.0
    com.apple.iokit.IOSerialFamily          10.0.7
    com.apple.driver.DspFuncLib          2.6.1f2
    com.apple.vecLib.kext          1.0.0
    com.apple.iokit.IOAudioFamily          1.9.7fc2
    com.apple.kext.OSvKernDSPLib          1.14
    com.apple.iokit.IOSurface          91.1
    com.apple.iokit.IOBluetoothFamily          4.2.4f1
    com.apple.nvidia.classic.NVDANV50HalTesla          8.2.4
    com.apple.nvidia.classic.NVDAResmanTesla          8.2.4
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.driver.AppleGraphicsControl          3.5.26
    com.apple.iokit.IOBluetoothHostControllerUSBTransport          4.2.4f1
    com.apple.iokit.IOFireWireIP          2.2.6
    com.apple.driver.AppleSMBusController          1.0.11d1
    com.apple.driver.AppleSMBusPCI          1.0.12d1
    com.apple.iokit.IONDRVSupport          2.4.1
    com.apple.driver.AppleHDAController          2.6.1f2
    com.apple.iokit.IOGraphicsFamily          2.4.1
    com.apple.iokit.IOHDAFamily          2.6.1f2
    com.apple.driver.IOPlatformPluginLegacy          1.0.0
    com.apple.driver.IOPlatformPluginFamily          5.7.0d11
    com.apple.driver.AppleSMC          3.1.8
    com.apple.iokit.IOSCSIBlockCommandsDevice          3.6.6
    com.apple.iokit.IOUSBMassStorageClass          3.6.0
    com.apple.driver.AppleUSBMultitouch          240.9
    com.apple.iokit.IOUSBHIDDriver          660.4.0
    com.apple.driver.AppleUSBMergeNub          650.4.0
    com.apple.driver.AppleUSBComposite          656.4.1
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.6.6
    com.apple.iokit.IOBDStorageFamily          1.7
    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily          1.7.1
    com.apple.iokit.IOAHCISerialATAPI          2.6.1
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.6.6
    com.apple.iokit.IOFireWireFamily          4.5.5
    com.apple.iokit.IOEthernetAVBController          1.0.3b4
    com.apple.driver.mDNSOffloadUserClient          1.0.1b5
    com.apple.iokit.IOUSBUserClient          660.4.2
    com.apple.iokit.IOAHCIFamily          2.6.5
    com.apple.iokit.IO80211Family          630.35
    com.apple.iokit.IONetworkingFamily          3.2
    com.apple.iokit.IOUSBFamily          677.4.0
    com.apple.driver.AppleEFINVRAM          2.0
    com.apple.driver.AppleEFIRuntime          2.0
    com.apple.iokit.IOHIDFamily          2.0.0
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          278.11
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.AppleKeyStore          2
    com.apple.driver.DiskImages          371.1
    com.apple.iokit.IOStorageFamily          1.9
    com.apple.iokit.IOReportFamily          23
    com.apple.driver.AppleFDEKeyStore          28.30
    com.apple.driver.AppleACPIPlatform          2.0
    com.apple.iokit.IOPCIFamily          2.9
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.corecrypto          1.0
    com.apple.kec.pthread          1
    Model: MacBookPro6,2, BootROM MBP61.0057.B0C, 2 processors, Intel Core i5, 2.53 GHz, 4 GB, SMC 1.58f16
    Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
    Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 256 MB
    Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533654465238432D47372020
    Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533654465238432D47372020
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.106.98.100.22)
    Bluetooth: Version 4.2.4f1 13674, 3 services, 23 devices, 1 incoming serial ports
    Network Service: Ethernet, Ethernet, en0
    Serial ATA Device: ST9500325ASG, 500.11 GB
    Serial ATA Device: MATSHITADVD-R   UJ-898
    USB Device: Hub
    USB Device: BRCM2070 Hub
    USB Device: Bluetooth USB Host Controller
    USB Device: Apple Internal Keyboard / Trackpad
    USB Device: Internal Memory Card Reader
    USB Device: Hub
    USB Device: Built-in iSight
    USB Device: IR Receiver
    Thunderbolt Bus:

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  • ICloud keeps switching off in Pages settings

    In the Pages settings on the iDevice I turn on iCloud. I go to Pages; come back to settings and see it switch off. I try to share from Pages to iCloud on the iDevice and it offers sharing to the iDisk, but not to iCloud. I can upload from Pages on the Mac to iWork, and I can upload a Pages document to iWork.com from the iDevice, but I can't get to iWork in iCloud. I'm not sure where in the mess of transferring the hang up is, but the one thing I cannot do is pull a document from iWork or iCloud onto my iDevice.
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    That to add to your confusion is another way of saving documents from iWork apps (on iOS devices).
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