MacBook Pro is no longer working properly when connected to external monitor, help!

My macbookpro has started giving me blue screen issues when connected to my external monitor.  It was working fine but now makes the computer unusable when connected. Using i-wire lead from thunderbolt to hdmi on monitor. Monitor works fine when connected to old HP notebook using HDMI lead so monitor not faulty.  What has changed on my mac to cause this?

You can change your password to avoid the "L" and you can take your machine into Apple for a keyboard replacement, free under AppleCare/warranty.
See #6 here
..Step by Step to fix your Mac
and if your on 10.6 and no boot disks
Snow Leopard 10.6 password reset, no disk method
Also backup your data first
Most commonly used backup methods
How do I securely delete data from the machine?

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    com.apple.driver.AppleIntelCPUPowerManagementClient          216.0.0
    com.apple.nke.applicationfirewall          153
    com.apple.security.quarantine          3
    com.apple.driver.AppleIntelCPUPowerManagement          216.0.0
    com.apple.driver.IOBluetoothHIDDriver          4.2.0f6
    com.apple.driver.AppleMultitouchDriver          245.13
    com.apple.kext.triggers          1.0
    com.apple.iokit.IOSerialFamily          10.0.7
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.6.0
    com.apple.driver.DspFuncLib          2.5.2fc2
    com.apple.vecLib.kext          1.0.0
    com.apple.iokit.IOAudioFamily          1.9.4fc11
    com.apple.kext.OSvKernDSPLib          1.14
    com.apple.iokit.IOAcceleratorFamily          98.7.1
    com.apple.nvidia.driver.NVDAGK100Hal          8.1.8
    com.apple.nvidia.driver.NVDAResman          8.1.8
    com.apple.iokit.IOBluetoothFamily          4.2.0f6
    com.apple.driver.IOPlatformPluginLegacy          1.0.0
    com.apple.iokit.IOBluetoothHostControllerUSBTransport          4.2.0f6
    com.apple.driver.X86PlatformPlugin          1.0.0
    com.apple.iokit.IOSurface          91
    com.apple.driver.AppleSMBusPCI          1.0.12d1
    com.apple.driver.AppleHDAController          2.5.2fc2
    com.apple.iokit.IOHDAFamily          2.5.2fc2
    com.apple.driver.AppleSMC          3.1.6d1
    com.apple.driver.IOPlatformPluginFamily          5.5.1d27
    com.apple.driver.AppleGraphicsControl          3.4.12
    com.apple.iokit.IOAcceleratorFamily2          98.7.1
    com.apple.AppleGraphicsDeviceControl          3.4.12
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.iokit.IONDRVSupport          2.3.6
    com.apple.driver.AppleSMBusController          1.0.11d1
    com.apple.iokit.IOGraphicsFamily          2.3.6
    com.apple.driver.AppleThunderboltEDMSink          1.2.1
    com.apple.driver.AppleThunderboltDPOutAdapter          2.5.0
    com.apple.driver.AppleThunderboltDPInAdapter          2.5.0
    com.apple.driver.AppleThunderboltDPAdapterFamily          2.5.0
    com.apple.driver.AppleThunderboltPCIDownAdapter          1.4.0
    com.apple.driver.AppleUSBMultitouch          240.6
    com.apple.iokit.IOUSBHIDDriver          650.4.4
    com.apple.driver.AppleUSBMergeNub          650.4.0
    com.apple.driver.AppleUSBComposite          650.4.0
    com.apple.driver.AppleThunderboltNHI          1.9.2
    com.apple.iokit.IOThunderboltFamily          2.8.5
    com.apple.iokit.IOEthernetAVBController          1.0.3b3
    com.apple.driver.mDNSOffloadUserClient          1.0.1b4
    com.apple.iokit.IO80211Family          600.34
    com.apple.iokit.IONetworkingFamily          3.2
    com.apple.iokit.IOUSBUserClient          650.4.4
    com.apple.iokit.IOAHCIFamily          2.6.0
    com.apple.iokit.IOUSBFamily          650.4.4
    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          278.10
    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          21
    com.apple.driver.AppleFDEKeyStore          28.30
    com.apple.driver.AppleACPIPlatform          2.0
    com.apple.iokit.IOPCIFamily          2.8
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.corecrypto          1.0
    com.apple.kec.pthread          1
    System Profile:
    Model: MacBookPro10,1, BootROM MBP101.00EE.B02, 4 processors, Intel Core i7, 2.3 GHz, 8 GB, SMC 2.3f36
    Graphics: Intel HD Graphics 4000, Intel HD Graphics 4000, Built-In, 1024 MB
    Graphics: NVIDIA GeForce GT 650M, NVIDIA GeForce GT 650M, PCIe, 1024 MB
    Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54333531533642465238432D50422020
    Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54333531533642465238432D50422020
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xEF), Broadcom BCM43xx 1.0 (5.106.98.100.22)
    Bluetooth: Version 4.2.0f6 12982, 3 services, 23 devices, 1 incoming serial ports
    Serial ATA Device: APPLE SSD SM256E, 251 GB
    USB Device: Hub
    USB Device: FaceTime HD Camera (Built-in)
    USB Device: Hub
    USB Device: Hub
    USB Device: BRCM20702 Hub
    USB Device: Bluetooth USB Host Controller
    USB Device: Apple Internal Keyboard / Trackpad
    Thunderbolt Bus: MacBook Pro, Apple Inc., 23.4

    Starting today, my MacBook Pro started crashing with the below panic report. It appears to only happen when I connect external monitors to the Thunderbolt port. I've been using multiple monitors for the last 6 months without issue.
    Thanks in advance.
    Anonymous UUID:       A360D603-6A80-886D-AD0E-D45705CFADBD
    Thu Dec 12 10:25:15 2013
    panic(cpu 2 caller 0xffffff7f922c8fac): "GPU Panic: [<None>] 4 0 a0 d9 9 8 0 3 : NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0x112c00000 0xffffff811b67d000 0x0e7150a2, D0, P1/4\n"@/SourceCache/AppleGraphicsControl/AppleGraphicsControl-3.4.12/src/Apple MuxControl/kext/GPUPanic.cpp:127
    Backtrace (CPU 2), Frame : Return Address
    0xffffff810aaf2f90 : 0xffffff8010022f69
    0xffffff810aaf3010 : 0xffffff7f922c8fac
    0xffffff810aaf30e0 : 0xffffff7f909fbcf8
    0xffffff810aaf31a0 : 0xffffff7f90ac8e26
    0xffffff810aaf31e0 : 0xffffff7f90ac8e84
    0xffffff810aaf3250 : 0xffffff7f90cf3f31
    0xffffff810aaf32c0 : 0xffffff7f90aec011
    0xffffff810aaf32e0 : 0xffffff7f90a02841
    0xffffff810aaf3390 : 0xffffff7f90a00362
    0xffffff810aaf3590 : 0xffffff7f90a01acd
    0xffffff810aaf3660 : 0xffffff7f90ba36f9
    0xffffff810aaf36a0 : 0xffffff7f90ba1947
    0xffffff810aaf36c0 : 0xffffff7f90b9e553
    0xffffff810aaf3730 : 0xffffff7f90b94bcf
    0xffffff810aaf3820 : 0xffffff7f90b953b5
    0xffffff810aaf3850 : 0xffffff7f90b87dbe
    0xffffff810aaf3880 : 0xffffff7f90b99d66
    0xffffff810aaf3a10 : 0xffffff7f909aca2f
    0xffffff810aaf3a90 : 0xffffff7f9099cee2
    0xffffff810aaf3b10 : 0xffffff7f909a0e53
    0xffffff810aaf3b90 : 0xffffff7f909aef4b
    0xffffff810aaf3c40 : 0xffffff7f909a0c48
    0xffffff810aaf3c70 : 0xffffff7f909a0dd0
    0xffffff810aaf3cf0 : 0xffffff7f909aef4b
    0xffffff810aaf3da0 : 0xffffff7f909676f7
    0xffffff810aaf3e90 : 0xffffff7f90967250
    0xffffff810aaf3ec0 : 0xffffff7f909671a1
    0xffffff810aaf3ef0 : 0xffffff80104ada80
    0xffffff810aaf3f30 : 0xffffff80104ac522
    0xffffff810aaf3f80 : 0xffffff80104ac5f7
    0xffffff810aaf3fb0 : 0xffffff80100d6aa7
          Kernel Extensions in backtrace:
             com.apple.iokit.IOGraphicsFamily(2.3.6)[38E388A5-92D6-3388-B799-F2498E582287]@0 xffffff7f90958000->0xffffff7f9098ffff
                dependency: com.apple.iokit.IOPCIFamily(2.8)[447B4896-16FF-3616-95A2-1C516B2A1498]@0xffffff 7f906ba000
             com.apple.iokit.IONDRVSupport(2.3.6)[86BA68C6-18DD-30A1-ABF6-54597AD6C277]@0xff ffff7f9099b000->0xffffff7f909aafff
                dependency: com.apple.iokit.IOGraphicsFamily(2.3.6)[38E388A5-92D6-3388-B799-F2498E582287]@0 xffffff7f90958000
                dependency: com.apple.iokit.IOPCIFamily(2.8)[447B4896-16FF-3616-95A2-1C516B2A1498]@0xffffff 7f906ba000
             com.apple.driver.AppleMuxControl(3.4.12)[A4934A66-0E30-36E9-984A-650481102449]@ 0xffffff7f922bb000->0xffffff7f922cdfff
                dependency: com.apple.driver.AppleGraphicsControl(3.4.12)[661E3C87-5B97-3272-88FF-B9BA9B6E2 4ED]@0xffffff7f922b3000
                dependency: com.apple.iokit.IOACPIFamily(1.4)[045D5D6F-AD1E-36DB-A249-A346E2B48E54]@0xfffff f7f912c4000
                dependency: com.apple.iokit.IOPCIFamily(2.8)[447B4896-16FF-3616-95A2-1C516B2A1498]@0xffffff 7f906ba000
                dependency: com.apple.iokit.IOGraphicsFamily(2.3.6)[38E388A5-92D6-3388-B799-F2498E582287]@0 xffffff7f90958000
                dependency: com.apple.driver.AppleBacklightExpert(1.0.4)[E04639C5-D734-3AB3-A682-FE66694C66 53]@0xffffff7f922b6000
             com.apple.nvidia.driver.NVDAResman(8.1.8)[3A2A3C2D-E129-3190-A682-E831B38F0FBF] @0xffffff7f909ab000->0xffffff7f90c15fff
                dependency: com.apple.iokit.IOPCIFamily(2.8)[447B4896-16FF-3616-95A2-1C516B2A1498]@0xffffff 7f906ba000
                dependency: com.apple.iokit.IONDRVSupport(2.3.6)[86BA68C6-18DD-30A1-ABF6-54597AD6C277]@0xff ffff7f9099b000
                dependency: com.apple.iokit.IOGraphicsFamily(2.3.6)[38E388A5-92D6-3388-B799-F2498E582287]@0 xffffff7f90958000
             com.apple.nvidia.driver.NVDAGK100Hal(8.1.8)[3CF8C2FA-83E6-39E3-A5B7-C7CC839B8C7 5]@0xffffff7f90c20000->0xffffff7f90dcffff
                dependency: com.apple.nvidia.driver.NVDAResman(8.1.8)[3A2A3C2D-E129-3190-A682-E831B38F0FBF] @0xffffff7f909ab000
                dependency: com.apple.iokit.IOPCIFamily(2.8)[447B4896-16FF-3616-95A2-1C516B2A1498]@0xffffff 7f906ba000
    BSD process name corresponding to current thread: kernel_task
    Mac OS version:
    13A603
    Kernel version:
    Darwin Kernel Version 13.0.0: Thu Sep 19 22:22:27 PDT 2013; root:xnu-2422.1.72~6/RELEASE_X86_64
    Kernel UUID: 1D9369E3-D0A5-31B6-8D16-BFFBBB390393
    Kernel slide:     0x000000000fe00000
    Kernel text base: 0xffffff8010000000
    System model name: MacBookPro10,1 (Mac-C3EC7CD22292981F)
    System uptime in nanoseconds: 10854270617
    last loaded kext at 5245204296: com.apple.driver.AppleHWSensor          1.9.5d0 (addr 0xffffff7f92025000, size 36864)
    loaded kexts:
    com.displaylink.driver.DisplayLinkDriver          2.0
    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.driver.AppleBluetoothMultitouch          80.14
    com.apple.driver.AudioAUUC          1.60
    com.apple.filesystems.autofs          3.0
    com.apple.iokit.IOBluetoothSerialManager          4.2.0f6
    com.apple.driver.AGPM          100.14.11
    com.apple.driver.ApplePlatformEnabler          2.0.9d1
    com.apple.driver.X86PlatformShim          1.0.0
    com.apple.driver.AppleMikeyHIDDriver          124
    com.apple.driver.AppleHDAHardwareConfigDriver          2.5.2fc2
    com.apple.driver.AppleHDA          2.5.2fc2
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.GeForce          8.1.8
    com.apple.driver.AppleUpstreamUserClient          3.5.13
    com.apple.driver.AppleMikeyDriver          2.5.2fc2
    com.apple.iokit.IOBluetoothUSBDFU          4.2.0f6
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport          4.2.0f6
    com.apple.driver.AppleIntelHD4000Graphics          8.1.8
    com.apple.driver.AppleHWAccess          1
    com.apple.nvidia.NVDAStartup          8.1.8
    com.apple.driver.AppleSMCPDRC          1.0.0
    com.apple.driver.AppleSMCLMU          2.0.4d1
    com.apple.driver.AppleLPC          1.7.0
    com.apple.driver.AppleMuxControl          3.4.12
    com.apple.driver.AppleIntelFramebufferCapri          8.1.8
    com.apple.driver.AppleBacklight          170.3.5
    com.apple.driver.AppleMCCSControl          1.1.12
    com.apple.driver.AppleThunderboltIP          1.0.10
    com.apple.driver.AppleUSBTCButtons          240.2
    com.apple.driver.AppleUSBTCKeyEventDriver          240.2
    com.apple.driver.AppleUSBTCKeyboard          240.2
    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.XsanFilter          404
    com.apple.iokit.IOAHCIBlockStorage          2.4.0
    com.apple.driver.AppleSDXC          1.4.0
    com.apple.driver.AppleUSBHub          650.4.4
    com.apple.iokit.AppleBCM5701Ethernet          3.6.9b9
    com.apple.driver.AirPort.Brcm4331          700.20.22
    com.apple.driver.AppleAHCIPort          2.9.5
    com.apple.driver.AppleUSBEHCI          650.4.1
    com.apple.driver.AppleUSBXHCI          650.4.3
    com.apple.driver.AppleSmartBatteryManager          161.0.0
    com.apple.driver.AppleACPIButtons          2.0
    com.apple.driver.AppleRTC          2.0
    com.apple.driver.AppleHPET          1.8
    com.apple.driver.AppleSMBIOS          2.0
    com.apple.driver.AppleACPIEC          2.0
    com.apple.driver.AppleAPIC          1.7
    com.apple.driver.AppleIntelCPUPowerManagementClient          216.0.0
    com.apple.nke.applicationfirewall          153
    com.apple.security.quarantine          3
    com.apple.driver.AppleIntelCPUPowerManagement          216.0.0
    com.apple.driver.IOBluetoothHIDDriver          4.2.0f6
    com.apple.driver.AppleMultitouchDriver          245.13
    com.apple.kext.triggers          1.0
    com.apple.iokit.IOSerialFamily          10.0.7
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.6.0
    com.apple.driver.DspFuncLib          2.5.2fc2
    com.apple.vecLib.kext          1.0.0
    com.apple.iokit.IOAudioFamily          1.9.4fc11
    com.apple.kext.OSvKernDSPLib          1.14
    com.apple.iokit.IOAcceleratorFamily          98.7.1
    com.apple.nvidia.driver.NVDAGK100Hal          8.1.8
    com.apple.nvidia.driver.NVDAResman          8.1.8
    com.apple.iokit.IOBluetoothFamily          4.2.0f6
    com.apple.driver.IOPlatformPluginLegacy          1.0.0
    com.apple.iokit.IOBluetoothHostControllerUSBTransport          4.2.0f6
    com.apple.driver.X86PlatformPlugin          1.0.0
    com.apple.iokit.IOSurface          91
    com.apple.driver.AppleSMBusPCI          1.0.12d1
    com.apple.driver.AppleHDAController          2.5.2fc2
    com.apple.iokit.IOHDAFamily          2.5.2fc2
    com.apple.driver.AppleSMC          3.1.6d1
    com.apple.driver.IOPlatformPluginFamily          5.5.1d27
    com.apple.driver.AppleGraphicsControl          3.4.12
    com.apple.iokit.IOAcceleratorFamily2          98.7.1
    com.apple.AppleGraphicsDeviceControl          3.4.12
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.iokit.IONDRVSupport          2.3.6
    com.apple.driver.AppleSMBusController          1.0.11d1
    com.apple.iokit.IOGraphicsFamily          2.3.6
    com.apple.driver.AppleThunderboltEDMSink          1.2.1
    com.apple.driver.AppleThunderboltDPOutAdapter          2.5.0
    com.apple.driver.AppleThunderboltDPInAdapter          2.5.0
    com.apple.driver.AppleThunderboltDPAdapterFamily          2.5.0
    com.apple.driver.AppleThunderboltPCIDownAdapter          1.4.0
    com.apple.driver.AppleUSBMultitouch          240.6
    com.apple.iokit.IOUSBHIDDriver          650.4.4
    com.apple.driver.AppleUSBMergeNub          650.4.0
    com.apple.driver.AppleUSBComposite          650.4.0
    com.apple.driver.AppleThunderboltNHI          1.9.2
    com.apple.iokit.IOThunderboltFamily          2.8.5
    com.apple.iokit.IOEthernetAVBController          1.0.3b3
    com.apple.driver.mDNSOffloadUserClient          1.0.1b4
    com.apple.iokit.IO80211Family          600.34
    com.apple.iokit.IONetworkingFamily          3.2
    com.apple.iokit.IOUSBUserClient          650.4.4
    com.apple.iokit.IOAHCIFamily          2.6.0
    com.apple.iokit.IOUSBFamily          650.4.4
    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          278.10
    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          21
    com.apple.driver.AppleFDEKeyStore          28.30
    com.apple.driver.AppleACPIPlatform          2.0
    com.apple.iokit.IOPCIFamily          2.8
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.corecrypto          1.0
    com.apple.kec.pthread          1
    System Profile:
    Model: MacBookPro10,1, BootROM MBP101.00EE.B02, 4 processors, Intel Core i7, 2.3 GHz, 8 GB, SMC 2.3f36
    Graphics: Intel HD Graphics 4000, Intel HD Graphics 4000, Built-In, 1024 MB
    Graphics: NVIDIA GeForce GT 650M, NVIDIA GeForce GT 650M, PCIe, 1024 MB
    Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54333531533642465238432D50422020
    Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54333531533642465238432D50422020
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xEF), Broadcom BCM43xx 1.0 (5.106.98.100.22)
    Bluetooth: Version 4.2.0f6 12982, 3 services, 23 devices, 1 incoming serial ports
    Serial ATA Device: APPLE SSD SM256E, 251 GB
    USB Device: Hub
    USB Device: FaceTime HD Camera (Built-in)
    USB Device: Hub
    USB Device: Hub
    USB Device: BRCM20702 Hub
    USB Device: Bluetooth USB Host Controller
    USB Device: Apple Internal Keyboard / Trackpad
    Thunderbolt Bus: MacBook Pro, Apple Inc., 23.4

  • Garbled display at startup when connecting to External Monitor - MBP Early 2011.

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