Screen suddenly black when brightness is dimmed

Hello everybody,
I encountered a very strage behaviour yesterday at my iMac (27" 2,8GHz, 8GB, mid 2010).
Since 10 month I had the brightness of the display to maximum and no problems. Yesterday I tried to dim it to 2/3 of maximum.
I heard a very silent tone with a high frequency (like your dimmer in the livingroom for your lights), but it was not disturbing so much.
After some minutes the display got black _while_ i was working and moving the mouse.
I could reactivate it by
- going to sleep mode and waking up again or
- moving the mouse to one of my active corners (which has the function to swich off the screen) and moving it again to the middle of the screen
It is not predictable, but the display goes off when it is dimmed to much.
Had somebody of you the same issue?
Kind regards
Reinhard

Something i should add:
After a call to Apple I tried PRAM and SMC reset already but this did not solve the issue.

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Interval Since Last Panic Report: 1949305 sec
Panics Since Last Report:          1
Thu Feb 6 15:29:32 2014
panic(cpu 1 caller 0xffffff80002c4794): Kernel trap at 0xffffff7f81d89ff3, type 14=page fault, registers:
CR0: 0x0000000080010033, CR2: 0xffffff7acd4a2a7c, CR3: 0x0000000085d3b000, CR4: 0x0000000000000660
RAX: 0xffffffff4bffff56, RBX: 0x0000000000000000, RCX: 0x0000000000000001, RDX: 0x0000000000000000
RSP: 0xffffff807867b7c0, RBP: 0xffffff807867b800, RSI: 0xffffff7acd4a2a7c, RDI: 0xffffff8065292000
R8: 0x0000000000000001, R9: 0x0000000000000000, R10: 0xffffff7f81d44200, R11: 0xffffff800f8b45e8
R12: 0xffffff8065292000, R13: 0xffffff807867b860, R14: 0x0000000000000001, R15: 0xffffff7acd4a2a7c
RFL: 0x0000000000010286, RIP: 0xffffff7f81d89ff3, CS: 0x0000000000000008, SS: 0x0000000000000010
CR2: 0xffffff7acd4a2a7c, Error code: 0x0000000000000000, Faulting CPU: 0x1
Backtrace (CPU 1), Frame : Return Address
0xffffff807867b470 : 0xffffff8000220792
0xffffff807867b4f0 : 0xffffff80002c4794
0xffffff807867b6a0 : 0xffffff80002da55d
0xffffff807867b6c0 : 0xffffff7f81d89ff3
0xffffff807867b800 : 0xffffff7f81d8a694
0xffffff807867b890 : 0xffffff7f81d8b4ed
0xffffff807867b8d0 : 0xffffff7f81d472a1
0xffffff807867ba40 : 0xffffff7f81d8bd6d
0xffffff807867bb00 : 0xffffff7f81d44346
0xffffff807867bb60 : 0xffffff8000655f3e
0xffffff807867bb80 : 0xffffff800065681a
0xffffff807867bbe0 : 0xffffff8000656fbb
0xffffff807867bd20 : 0xffffff80002a3f08
0xffffff807867be20 : 0xffffff8000223096
0xffffff807867be50 : 0xffffff80002148a9
0xffffff807867beb0 : 0xffffff800021bbd8
0xffffff807867bf10 : 0xffffff80002af140
0xffffff807867bfb0 : 0xffffff80002dab5e
      Kernel Extensions in backtrace:
         com.apple.GeForce(7.3.2)[7E1D7726-416F-3716-ACCB-E1E276E35002]@0xffffff7f81d390 00->0xffffff7f81dfbfff
            dependency: com.apple.NVDAResman(7.3.2)[97284661-2629-379E-B86B-D388618E8C30]@0xffffff7f808 b0000
            dependency: com.apple.iokit.IONDRVSupport(2.3.4)[7C8672C4-8B0D-3CCF-A79A-23C62E90F895]@0xff ffff7f8089e000
            dependency: com.apple.iokit.IOPCIFamily(2.7)[5C23D598-58B2-3204-BC03-BC3C0F00BD32]@0xffffff 7f8082b000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[D0A1F6BD-E66E-3DD8-9913-A3AB8746F422]@0 xffffff7f80865000
BSD process name corresponding to current thread: iPhoto
Mac OS version:
11G63
Kernel version:
Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64
Kernel UUID: FF3BB088-60A4-349C-92EA-CA649C698CE5
System model name: iMac10,1 (Mac-F2268CC8)
System uptime in nanoseconds: 11526391261403
last loaded kext at 23020191300: com.apple.driver.AppleHWSensor    1.9.5d0 (addr 0xffffff7f8234b000, size 28672)
last unloaded kext at 522057763087: com.apple.driver.AppleFileSystemDriver    13 (addr 0xffffff7f8254c000, size 12288)
loaded kexts:
com.apple.driver.AppleHWSensor    1.9.5d0
com.apple.driver.AppleBluetoothMultitouch    70.12
com.apple.filesystems.autofs    3.0
com.apple.iokit.IOBluetoothSerialManager    4.0.8f17
com.apple.driver.AudioAUUC    1.59
com.apple.driver.AppleMikeyHIDDriver    122
com.apple.driver.AppleHDA    2.2.5a5
com.apple.driver.AppleUpstreamUserClient    3.5.9
com.apple.driver.AppleMikeyDriver    2.2.5a5
com.apple.driver.AppleBacklight    170.2.2
com.apple.driver.AppleMCCSControl    1.0.33
com.apple.driver.AppleLPC    1.6.0
com.apple.driver.AGPM    100.12.75
com.apple.iokit.IOUserEthernet    1.0.0d1
com.apple.Dont_Steal_Mac_OS_X    7.0.0
com.apple.driver.AudioIPCDriver    1.2.3
com.apple.driver.ApplePolicyControl    3.1.33
com.apple.GeForce    7.3.2
com.apple.driver.ACPI_SMC_PlatformPlugin    5.0.0d8
com.apple.driver.BroadcomUSBBluetoothHCIController    4.0.8f17
com.apple.driver.AppleUSBCardReader    3.0.6
com.apple.driver.AppleIRController    312
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
com.apple.BootCache    33
com.apple.iokit.SCSITaskUserClient    3.2.1
com.apple.iokit.IOAHCISerialATAPI    2.0.3
com.apple.driver.XsanFilter    404
com.apple.iokit.IOAHCIBlockStorage    2.1.0
com.apple.driver.AppleRTC    1.5
com.apple.driver.AppleFWOHCI    4.9.0
com.apple.driver.AirPort.Atheros40    505.67.1
com.apple.driver.AppleAHCIPort    2.3.1
com.apple.nvenet    2.0.17
com.apple.driver.AppleUSBHub    5.1.0
com.apple.driver.AppleUSBEHCI    5.1.0
com.apple.driver.AppleUSBOHCI    5.1.0
com.apple.driver.AppleEFINVRAM    1.6.1
com.apple.driver.AppleHPET    1.7
com.apple.driver.AppleACPIButtons    1.5
com.apple.driver.AppleSMBIOS    1.9
com.apple.driver.AppleACPIEC    1.5
com.apple.driver.AppleAPIC    1.6
com.apple.driver.AppleIntelCPUPowerManagementClient    195.0.0
com.apple.nke.applicationfirewall    3.2.30
com.apple.security.quarantine    1.4
com.apple.security.TMSafetyNet    8
com.apple.driver.AppleIntelCPUPowerManagement    195.0.0
com.apple.driver.AppleMultitouchDriver    231.4
com.apple.driver.IOBluetoothHIDDriver    4.0.8f17
com.apple.kext.triggers    1.0
com.apple.iokit.IOSerialFamily    10.0.5
com.apple.driver.DspFuncLib    2.2.5a5
com.apple.driver.AppleBacklightExpert    1.0.4
com.apple.driver.AppleSMBusController    1.0.10d0
com.apple.driver.AppleSMBusPCI    1.0.10d0
com.apple.iokit.IOSurface    80.0.2
com.apple.iokit.IOAudioFamily    1.8.6fc18
com.apple.kext.OSvKernDSPLib    1.3
com.apple.driver.AppleGraphicsControl    3.1.33
com.apple.driver.AppleHDAController    2.2.5a5
com.apple.iokit.IOHDAFamily    2.2.5a5
com.apple.nvidia.nv50hal    7.3.2
com.apple.NVDAResman    7.3.2
com.apple.iokit.IONDRVSupport    2.3.4
com.apple.iokit.IOGraphicsFamily    2.3.4
com.apple.iokit.IOFireWireIP    2.2.5
com.apple.driver.IOPlatformPluginLegacy    5.0.0d8
com.apple.driver.IOPlatformPluginFamily    5.1.1d6
com.apple.driver.AppleSMC    3.1.3d10
com.apple.driver.AppleUSBBluetoothHCIController    4.0.8f17
com.apple.iokit.IOBluetoothFamily    4.0.8f17
com.apple.iokit.IOSCSIBlockCommandsDevice    3.2.1
com.apple.iokit.IOUSBMassStorageClass    3.0.3
com.apple.iokit.IOUSBHIDDriver    5.0.0
com.apple.driver.AppleUSBMergeNub    5.1.0
com.apple.driver.AppleUSBComposite    5.0.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice    3.2.1
com.apple.iokit.IOBDStorageFamily    1.7
com.apple.iokit.IODVDStorageFamily    1.7.1
com.apple.iokit.IOCDStorageFamily    1.7.1
com.apple.iokit.IOSCSIArchitectureModelFamily    3.2.1
com.apple.iokit.IOFireWireFamily    4.4.8
com.apple.iokit.IO80211Family    420.3
com.apple.iokit.IOAHCIFamily    2.0.8
com.apple.iokit.IONetworkingFamily    2.1
com.apple.iokit.IOUSBUserClient    5.0.0
com.apple.iokit.IOUSBFamily    5.1.0
com.apple.driver.NVSMU    2.2.9
com.apple.iokit.IOHIDFamily    1.7.1
com.apple.driver.AppleEFIRuntime    1.6.1
com.apple.iokit.IOSMBusFamily    1.1
com.apple.security.sandbox    177.11
com.apple.kext.AppleMatch    1.0.0d1
com.apple.driver.DiskImages    331.7
com.apple.iokit.IOStorageFamily    1.7.2
com.apple.driver.AppleKeyStore    28.18
com.apple.driver.AppleACPIPlatform    1.5
com.apple.iokit.IOPCIFamily    2.7
com.apple.iokit.IOACPIFamily    1.4
System Profile:
Model: iMac10,1, BootROM IM101.00CC.B00, 2 processors, Intel Core 2 Duo, 3.06 GHz, 4 GB, SMC 1.52f9
Graphics: NVIDIA GeForce 9400, NVIDIA GeForce 9400, PCI, 256 MB
Memory Module: BANK 0/DIMM1, 2 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353637334548312D4346382020
Memory Module: BANK 1/DIMM1, 2 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353637334548312D4346382020
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 4.0.67.5-P2P
Bluetooth: Version 4.0.8f17, 2 service, 18 devices, 1 incoming serial ports
Serial ATA Device: ST3500418ASQ, 500.11 GB
Serial ATA Device: HL-DT-ST DVDRW GA11N
USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0x24400000 / 2
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0x26500000 / 3
USB Device: USB2.0 Hub, 0x05e3 (Genesys Logic, Inc.), 0x0608, 0x26200000 / 2
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0x04500000 / 2
USB Device: Hub in Apple Extended USB Keyboard, apple_vendor_id, 0x1003, 0x06400000 / 3
USB Device: Apple Extended USB Keyboard, apple_vendor_id, 0x020b, 0x06430000 / 4
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06100000 / 2
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0x06110000 / 6

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Screen suddenly black when brightness is dimmed

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