MacBook Pro Target Display to iMac - Black Screen

I have a MacBook Pro (13'', Early 2011) & iMac (21.5", Mid 2011) using a Thunderbolt Cable to Target Display. Everything was working find and I could Command F2 to Target Display as expected. 
However, about a week about this stopped working. Now when I try to Target Display the iMac goes to a Black screen (like it's switching to Target Display) and the MacBook Pro does nothing. The iMac will be at the Black screen until I Command F2 again (or disconnect the Thunderbolt Cable), then the iMac goes back to the normal display.
I have tried another Thunderbolt cable with no luck. I have perform all software updates on both machines (now both running 10.7.3) and fixed Disk Permissions.
I have also found that restarting my MacBook Pro allows this to function as excepected (Command F2, Blue Flashing Screen, Target Display on the iMac). However, this is not an ideal situation since having to restart my computer is time consuming.
Any suggestions would be appriciated.

Hello all -
I've done some additional testing. I tried an completely different iMac (and Thunderbolt cable) this morning and saw the exact same behavior so it is definitly something specific to the MacBook Pro.
Again, a restart resolve the issue, so it appears to be related to after the computer goes into a hard sleep (cover closed), because I can leave for lunch (cover open) and the display will go to sleep and things will still work as expected.
Any thoughts/ideas woudl be appriciated.

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    - pram-reset, -> same result
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    what to do?
    Message was edited by: Klapschaats

    Just google Nvidia 8600m, and problem, or oh god my screen is dead, and see what comes up.
    Once again, if you have a Macbook Pro from mid-late 2007, chances are you have a bad chip. They will replace your logic board, with another bad chip, which may or may not go bad. It's an obvious issue, Nvidia admits they have a problem, and Apple is just going to quietly resolve individual problems.
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    <Edited by Moderator>

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    Hi pictureswithPS, welcome to Apple Discussions!
    1. I have an original late-2008 unibody MBP that was purchased a week after the introduction. I have never had a single "black screen of death" ever, and I do some gaming under OS X on my machine. The heat issues are, in my humble opinion, greatly exaggerated. Does the machine get warm? Yes. However, any computer with this much power in this thin of an enclosure is going to get warm. Mine has never crashed, frozen, black screened, etc. once.
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    3. Lastly I am aware that their are tools to manage fan speed behavior - as a workaround to cool down temperatures. Using this software would it void the warranty that is provided by Apple?
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    --Travis

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    If it has happened more than once, make a "Genius" appointment at an Apple Store to have the machine tested.
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    Panics Since Last Report:          1
    Anonymous UUID:                    C720018D-ED30-41E2-B39A-CEAAB6847A2A
    Fri May 20 19:31:07 2011
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    0xb9a2b8d8 : 0xa7cc8f (0xc9223c 0xd02840 0xca13cc 0x0)
    0xb9a2b978 : 0xb975d3 (0xdc95404 0xe7a3004 0x100 0xb9a2ba48)
    0xb9a2b9c8 : 0xb8e5cc (0xe7a3004 0x100 0xb9a2b9f8 0xa6c76c)
    0xb9a2b9f8 : 0x176e965 (0xe7a3004 0x100 0x438004ee 0x2b0a6c)
    0xb9a2bb38 : 0xbb6250 (0xe7a3004 0xe7a4004 0x0 0x0)
    0xb9a2bb78 : 0xa85e23 (0xe7a3004 0xe7a4004 0x0 0x0)
    0xb9a2bc18 : 0xa82502 (0x0 0x9 0x0 0x0)
    0xb9a2bdc8 : 0xa843d1 (0x0 0x600d600d 0x702a 0xb9a2bdf8)
    0xb9a2be98 : 0xa18582 (0xc1d00015 0xaa910001 0x20802040 0xb9a2bee0)
    0xb9a2bef8 : 0xdd84eb (0xe1de400 0xb9a2bf4c 0x0 0x7)
    0xb9a2bf58 : 0xdd8696 (0xe1e2600 0xddfb54 0xb9a2bf78 0x2a358d)
    0xb9a2bf78 : 0x22fd0d (0xe1e2600 0x0 0x0 0x6003)
    0xb9a2bfc8 : 0x2a06dc (0x863ea0 0x0 0x10 0x12cff200)
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             com.apple.driver.AGPM(100.12.19)@0xdd5000->0xddffff
                dependency: com.apple.iokit.IOGraphicsFamily(2.2)@0x9e7000
                dependency: com.apple.iokit.IONDRVSupport(2.2)@0xa09000
                dependency: com.apple.iokit.IOPCIFamily(2.6)@0x908000
             com.apple.nvidia.nv50hal(6.2.6)@0x1638000->0x1a4cfff
                dependency: com.apple.NVDAResman(6.2.6)@0xa16000
             com.apple.NVDAResman(6.2.6)@0xa16000->0xd03fff
                dependency: com.apple.iokit.IOPCIFamily(2.6)@0x908000
                dependency: com.apple.iokit.IONDRVSupport(2.2)@0xa09000
                dependency: com.apple.iokit.IOGraphicsFamily(2.2)@0x9e7000
    BSD process name corresponding to current thread: kernel_task
    Mac OS version:
    10J869
    Kernel version:
    Darwin Kernel Version 10.7.0: Sat Jan 29 15:17:16 PST 2011; root:xnu-1504.9.37~1/RELEASE_I386
    System model name: MacBookPro6,2 (Mac-F22586C8)
    System uptime in nanoseconds: 34337500932014
    unloaded kexts:
    com.apple.filesystems.cd9660          1.4.1 (addr 0xb9c71000, size 0x36864) - last unloaded 20423702674692
    loaded kexts:
    com.google.filesystems.fusefs          2.0.3 - last loaded 20349428727563
    com.vmware.kext.vmnet          3.1.2
    com.vmware.kext.vmioplug          3.1.2
    com.vmware.kext.vmci          3.1.2
    com.vmware.kext.vmx86          3.1.2
    com.sophos.kext.sav          7.2.0
    com.Logitech.Unifying.HID Driver          1.2.0
    com.Logitech.Control Center.HID Driver          3.3.0
    com.apple.filesystems.msdosfs          1.6.3
    com.apple.driver.AppleHWSensor          1.9.3d0
    com.apple.filesystems.autofs          2.1.0
    com.apple.driver.AGPM          100.12.19
    com.apple.driver.AppleMikeyHIDDriver          1.2.0
    com.apple.driver.AppleHDA          1.9.9f12
    com.apple.driver.AppleUpstreamUserClient          3.5.4
    com.apple.driver.AppleMCCSControl          1.0.17
    com.apple.driver.AppleMikeyDriver          1.9.9f12
    com.apple.driver.AudioAUUC          1.54
    com.apple.driver.AppleIntelHDGraphics          6.2.6
    com.apple.driver.AppleIntelHDGraphicsFB          6.2.6
    com.apple.driver.SMCMotionSensor          3.0.0d4
    com.apple.kext.AppleSMCLMU          1.5.0d3
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.iokit.CHUDUtils          364
    com.apple.iokit.CHUDProf          364
    com.apple.driver.AudioIPCDriver          1.1.6
    com.apple.driver.ACPI_SMC_PlatformPlugin          4.5.0d5
    com.apple.GeForce          6.2.6
    com.apple.driver.AppleGraphicsControl          2.8.68
    com.apple.driver.AppleLPC          1.4.12
    com.apple.filesystems.ntfs          3.4
    com.apple.driver.AppleUSBTCButtons          200.3.2
    com.apple.driver.AppleUSBCardReader          2.5.8
    com.apple.driver.AppleUSBTCKeyboard          200.3.2
    com.apple.driver.AppleIRController          303.8
    com.apple.iokit.SCSITaskUserClient          2.6.5
    com.apple.BootCache          31
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.iokit.IOAHCIBlockStorage          1.6.3
    com.apple.driver.AppleUSBHub          4.1.7
    com.apple.driver.AppleFWOHCI          4.7.1
    com.apple.iokit.AppleBCM5701Ethernet          2.3.9b6
    com.apple.driver.AirPortBrcm43224          427.36.9
    com.apple.driver.AppleAHCIPort          2.1.5
    com.apple.driver.AppleEFINVRAM          1.4.0
    com.apple.driver.AppleSmartBatteryManager          160.0.0
    com.apple.driver.AppleUSBEHCI          4.1.8
    com.apple.driver.AppleACPIButtons          1.3.5
    com.apple.driver.AppleRTC          1.3.1
    com.apple.driver.AppleHPET          1.5
    com.apple.driver.AppleSMBIOS          1.6
    com.apple.driver.AppleACPIEC          1.3.5
    com.apple.driver.AppleAPIC          1.4
    com.apple.driver.AppleIntelCPUPowerManagementClient          105.13.0
    com.apple.security.sandbox          1
    com.apple.security.quarantine          0
    com.apple.nke.applicationfirewall          2.1.11
    com.apple.driver.AppleIntelCPUPowerManagement          105.13.0
    com.apple.driver.DspFuncLib          1.9.9f12
    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.driver.AppleSMBusController          1.0.8d0
    com.apple.iokit.IOFireWireIP          2.0.3
    com.apple.iokit.IOSurface          74.2
    com.apple.iokit.IOBluetoothSerialManager          2.4.0f1
    com.apple.iokit.IOSerialFamily          10.0.3
    com.apple.iokit.CHUDKernLib          364
    com.apple.iokit.IOAudioFamily          1.8.0fc1
    com.apple.kext.OSvKernDSPLib          1.3
    com.apple.driver.AppleHDAController          1.9.9f12
    com.apple.iokit.IOHDAFamily          1.9.9f12
    com.apple.iokit.AppleProfileFamily          41.4
    com.apple.driver.AppleSMC          3.1.0d3
    com.apple.driver.IOPlatformPluginFamily          4.5.0d5
    com.apple.driver.AppleSMBusPCI          1.0.8d0
    com.apple.nvidia.nv50hal          6.2.6
    com.apple.NVDAResman          6.2.6
    com.apple.iokit.IONDRVSupport          2.2
    com.apple.iokit.IOGraphicsFamily          2.2
    com.apple.driver.BroadcomUSBBluetoothHCIController          2.4.0f1
    com.apple.driver.AppleUSBBluetoothHCIController          2.4.0f1
    com.apple.iokit.IOBluetoothFamily          2.4.0f1
    com.apple.iokit.IOSCSIBlockCommandsDevice          2.6.5
    com.apple.iokit.IOUSBMassStorageClass          2.6.5
    com.apple.driver.AppleUSBMultitouch          206.6
    com.apple.iokit.IOUSBHIDDriver          4.1.5
    com.apple.driver.AppleUSBMergeNub          4.1.8
    com.apple.driver.AppleUSBComposite          3.9.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          2.6.5
    com.apple.iokit.IOBDStorageFamily          1.6
    com.apple.iokit.IODVDStorageFamily          1.6
    com.apple.iokit.IOCDStorageFamily          1.6
    com.apple.driver.XsanFilter          402.1
    com.apple.iokit.IOAHCISerialATAPI          1.2.5
    com.apple.iokit.IOSCSIArchitectureModelFamily          2.6.5
    com.apple.iokit.IOUSBUserClient          4.1.5
    com.apple.iokit.IOFireWireFamily          4.2.6
    com.apple.iokit.IO80211Family          314.1.1
    com.apple.iokit.IONetworkingFamily          1.10
    com.apple.iokit.IOAHCIFamily          2.0.4
    com.apple.iokit.IOUSBFamily          4.1.8
    com.apple.driver.AppleEFIRuntime          1.4.0
    com.apple.iokit.IOHIDFamily          1.6.5
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          6
    com.apple.driver.DiskImages          289
    com.apple.iokit.IOStorageFamily          1.6.2
    com.apple.driver.AppleACPIPlatform          1.3.5
    com.apple.iokit.IOPCIFamily          2.6
    com.apple.iokit.IOACPIFamily          1.3.0
    Model: MacBookPro6,2, BootROM MBP61.0057.B0C, 2 processors, Intel Core i7, 2.66 GHz, 8 GB, SMC 1.58f16
    Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 512 MB
    Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
    Memory Module: global_name
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.10.131.36.9)
    Bluetooth: Version 2.4.0f1, 2 service, 12 devices, 1 incoming serial ports
    Network Service: AirPort, AirPort, en1
    Serial ATA Device: TOSHIBA MK5055GSXF, 465.76 GB
    Serial ATA Device: MATSHITADVD-R   UJ-898
    USB Device: Hub, 0x0424  (SMSC), 0x2514, 0xfd100000
    USB Device: USB2.0 Hub, 0x05e3  (Genesys Logic, Inc.), 0x0608, 0xfd130000
    USB Device: My Passport 071A, 0x1058  (Western Digital Technologies, Inc.), 0x071a, 0xfd134000
    USB Device: USB Receiver, 0x046d  (Logitech Inc.), 0xc52b, 0xfd133000
    USB Device: IR Receiver, 0x05ac  (Apple Inc.), 0x8242, 0xfd120000
    USB Device: Built-in iSight, 0x05ac  (Apple Inc.), 0x8507, 0xfd110000
    USB Device: Hub, 0x0424  (SMSC), 0x2514, 0xfa100000
    USB Device: Internal Memory Card Reader, 0x05ac  (Apple Inc.), 0x8403, 0xfa130000
    USB Device: Apple Internal Keyboard / Trackpad, 0x05ac  (Apple Inc.), 0x0236, 0xfa120000
    USB Device: BRCM2070 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000
    USB Device: Bluetooth USB Host Controller, 0x05ac  (Apple Inc.), 0x8218, 0xfa113000

    Try running your hardware tester once.  
    17" 2.2GHz i7 Quad-Core MacBook Pro  8G RAM  750G HD + OCZ Vertex 3 SSD Boot HD 
    Got problems with your Apple iDevice-like iPhone, iPad or iPod touch? Try Troubleshooting 101

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