MBP randomly crashes when in clamshell with external display

Hi Mac people.
As described in the "subject field" i have been encountering some random crashes after i startet using my MBP in clamshell with my newly pruchased 24" 16:10 NEC display .
typically it occurs after about 10-20 minutes of playing world of warcraft.
-the screen goes black, saying no signal, and the MBP doesn't react to anything else but holding down the on/off button.
i have tried using the key combination alt-cmd-eject to see if i could make the computer sleep and then turn it on by opening the lid.-getting it out of clamshell to get the built-in display active again.
but none of that worked.
i also checked the dvi<->mini-displayport adapter for lose connections but i didn't find any
i have had my NEC display for about a month, and the problem has occured about 8 times now.
befor i started using my MBP in clamshell with an external display, i had no problems.
Interval Since Last Panic Report: 73505 sec
Panics Since Last Report: 3
Anonymous UUID: C8DD4168-ECC7-4842-9EF5-233F8D9763C9
Fri Jan 7 11:41:39 2011
panic(cpu 0 caller 0x00C566A4): NVRM[0]: Read Error 0x00009410: BAR0 0xa4000000 0x3f92e000 0x096380c1 D0 P3/4
Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x304fad98 : 0x12b4c6 (0x45f91c 0x304fadcc 0x13355c 0x0)
0x304fade8 : 0xc566a4 (0xe86e80 0xe86e80 0xe4b6d4 0x0)
0x304fae48 : 0xf0fdf0 (0x539a004 0x533c804 0x9410 0xc92d06)
0x304fae88 : 0xf3a57d (0x533c804 0x9410 0x5c00 0x9)
0x304faec8 : 0xd5814f (0x533c804 0x46eb004 0x0 0x0)
0x304faee8 : 0xc983f1 (0x46eb004 0x304faf74 0x0 0x0)
0x304faf28 : 0xeabdb8 (0x533c804 0x3d0900 0x304faf74 0x0)
0x304fafa8 : 0xee10e4 (0x533c804 0x54a1804 0x1 0x1)
0x304fb138 : 0xee5479 (0x533c804 0x54a2004 0x4bc6a44 0x0)
0x304fb298 : 0xca227b (0x533c804 0x54a2004 0x0 0x8b46184)
0x304fb348 : 0xc63a19 (0xc1d00041 0xbeef0003 0xcafe1691 0x8b46300)
0x304fb3b8 : 0xc547ed (0x304fb548 0x6 0x0 0x0)
0x304fb518 : 0xc462d4 (0x0 0x600d600d 0x7057 0x304fb548)
0x304fb5d8 : 0x114c77b (0xc1d00041 0xbeef0003 0xcafe1691 0x8b46300)
0x304fb658 : 0x114ca53 (0x20552000 0x8b46300 0x8b48404 0x0)
0x304fb698 : 0x11136e7 (0x20552000 0x8b48400 0x304fb6a8 0x20555068)
Backtrace continues...
Kernel loadable modules in backtrace (with dependencies):
com.apple.GeForce(5.4.8)@0x10f9000->0x1190fff
dependency: com.apple.NVDAResman(5.4.8)@0xc3d000
dependency: com.apple.iokit.IONDRVSupport(1.7.3)@0xc2f000
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x63e000
dependency: com.apple.iokit.IOGraphicsFamily(1.7.3)@0x791000
com.apple.nvidia.nv50hal(5.4.8)@0xe9c000->0x10effff
dependency: com.apple.NVDAResman(5.4.8)@0xc3d000
com.apple.NVDAResman(5.4.8)@0xc3d000->0xe9bfff
dependency: com.apple.iokit.IONDRVSupport(1.7.3)@0xc2f000
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x63e000
dependency: com.apple.iokit.IOGraphicsFamily(1.7.3)@0x791000
BSD process name corresponding to current thread: World of Warcraf
Mac OS version:
9L30
Kernel version:
Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386
System model name: MacBookPro5,1 (Mac-F42D86C8)
System uptime in nanoseconds: 565038856165
unloaded kexts:
com.apple.driver.InternalModemSupport 2.4.0 - last unloaded 149627740291
loaded kexts:
com.apple.filesystems.cddafs 2.3.0 - last loaded 171968100440
com.apple.driver.AppleHWSensor 1.9d0
com.apple.filesystems.ntfs 2.1
com.apple.filesystems.autofs 2.0.2
com.apple.driver.AppleUSBTCButtons 1.7.4f1
com.apple.driver.AppleMikeyHIDDriver 1.0.6
com.apple.driver.AppleUpstreamUserClient 2.7.5
com.apple.driver.AppleMikeyDriver 1.7.1a2
com.apple.driver.AppleHDA 1.7.1a2
com.apple.driver.AGPM 100.8.7
com.apple.driver.AppleHDAController 1.7.1a2
com.apple.iokit.IOBluetoothSerialManager 2.1.9f10
com.apple.driver.SMCMotionSensor 2.1.1d2
com.apple.DontSteal_Mac_OSX 6.0.3
com.apple.iokit.IOFireWireIP 1.7.7
com.apple.driver.AppleIRController 113
com.apple.driver.AudioIPCDriver 1.0.6
com.apple.kext.AppleSMCLMU 1.4.5d1
com.apple.driver.AppleGraphicsControl 2.8.15
com.apple.driver.ACPISMCPlatformPlugin 3.4.0a17
com.apple.driver.NVSMU 1.1.7
com.apple.driver.AppleSMBusPCI 1.0.1d1
com.apple.driver.AppleLPC 1.3.1
com.apple.GeForce 5.4.8
com.apple.nvidia.nv50hal 5.4.8
com.apple.driver.AppleUSBMultitouch 189.35
com.apple.driver.AppleUSBTCKeyboard 1.7.4f1
com.apple.driver.AppleHIDKeyboard 1.0.9b4
com.apple.driver.BroadcomUSBBluetoothHCIController 2.1.9f10
com.apple.driver.AppleUSBMergeNub 3.5.2
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.1.1
com.apple.iokit.SCSITaskUserClient 2.1.1
com.apple.driver.XsanFilter 2.7.91
com.apple.iokit.IOAHCISerialATAPI 1.1.2
com.apple.iokit.IOAHCIBlockStorage 1.2.3
com.apple.driver.AppleAHCIPort 1.7.0
com.apple.driver.AppleUSBHub 3.4.9
com.apple.iokit.IOUSBUserClient 3.5.2
com.apple.driver.AirPortBrcm43xx 365.91.19
com.apple.driver.AppleFWOHCI 3.9.7
com.apple.nvenet 1.0.54
com.apple.driver.AppleUSBEHCI 3.4.6
com.apple.driver.AppleUSBOHCI 3.4.6
com.apple.driver.AppleEFINVRAM 1.2.0
com.apple.driver.AppleSmartBatteryManager 158.10.5
com.apple.driver.AppleRTC 1.2.3
com.apple.driver.AppleHPET 1.4
com.apple.driver.AppleACPIPCI 1.2.5
com.apple.driver.AppleACPIButtons 1.2.5
com.apple.driver.AppleSMBIOS 1.4
com.apple.driver.AppleACPIEC 1.2.5
com.apple.driver.AppleAPIC 1.4
com.apple.security.seatbelt 107.12
com.apple.nke.applicationfirewall 1.8.77
com.apple.security.TMSafetyNet 3
com.apple.driver.AppleIntelCPUPowerManagement 76.2.0
com.apple.driver.DiskImages 199
com.apple.BootCache 30.4
com.apple.driver.DspFuncLib 1.7.1a2
com.apple.driver.AppleSMBusController 1.0.1d1
com.apple.iokit.IOHDAFamily 1.7.1a2
com.apple.iokit.IOSerialFamily 9.4
com.apple.iokit.IOAudioFamily 1.6.9fc5
com.apple.kext.OSvKernDSPLib 1.1
com.apple.driver.IOPlatformPluginFamily 3.4.0a17
com.apple.NVDAResman 5.4.8
com.apple.iokit.IONDRVSupport 1.7.3
com.apple.iokit.IOGraphicsFamily 1.7.3
com.apple.driver.AppleSMC 2.3.1d1
com.apple.iokit.IOUSBHIDDriver 3.4.6
com.apple.driver.AppleUSBBluetoothHCIController 2.1.9f10
com.apple.iokit.IOBluetoothFamily 2.1.9f10
com.apple.driver.AppleUSBComposite 3.2.0
com.apple.iokit.IOSCSIBlockCommandsDevice 2.1.1
com.apple.iokit.IOBDStorageFamily 1.5
com.apple.iokit.IODVDStorageFamily 1.5
com.apple.iokit.IOCDStorageFamily 1.5
com.apple.iokit.IOSCSIArchitectureModelFamily 2.1.1
com.apple.iokit.IOAHCIFamily 1.5.0
com.apple.iokit.IO80211Family 216.1
com.apple.iokit.IOFireWireFamily 3.4.9
com.apple.iokit.IONetworkingFamily 1.6.1
com.apple.iokit.IOUSBFamily 3.5.2
com.apple.driver.AppleEFIRuntime 1.2.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.iokit.IOStorageFamily 1.5.6
com.apple.iokit.IOHIDFamily 1.5.5
com.apple.driver.AppleACPIPlatform 1.2.5
com.apple.iokit.IOPCIFamily 2.6
com.apple.iokit.IOACPIFamily 1.2.0
Any help would be much appreciated

Lets give it a try. 1st of all post your s/n (so I can run a check on your specific model) or check with system profiler if your machine has the NVidia Geforce 8600 M GT. Or see for yourself: http://www.chipmunk.nl/cgi-fast/applemodel.cgi
IF SO:
Surely, you've heard about the generic problems with this specific video chip: sooner or later most of them will fail due to chip packaging/bonding issues. If yours has not failed before, it may be doing so now because you're driving it harder with a larger external monitor attached, thus probably running the affected videochip hotter. Very useful link: http://www.xlr8yourmac.com/feedback/MacBookProvideofailure.html#novideotip , loads of other useful links on the subject therein.
To solve this, Apple has instigated an extended warranty, so do not tread on the tail of your machine's capabilities any more. Once it will not boot (which may eventually happen), it gets really hard to run diagnostics. Have it checked by at least 1, preferably more ASPs (see link), and kindly ask them to reiterate the test 2 or 3 times. Often, the problem will not show up on the 1st try.
I am reading increasing numbers of questions and complaints about this on the Flemish/Belgian Apple forum "Intermactivity", most users seem to be unaware of the problem (though this has been common knowledge for years), and moreover, most ASPs are reluctant to acknowledge it.
So if your machine is one of the affected, you will really have to stand your case. Especially in Europe!

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