Auf mal wie aus Geisterhand ist der Rechner aus und startet nur noch mit einem weissen Bildschirm

Hier der Konsolen bericht , ich bitte um Hilfe

Sun Nov 25 14:26:28 2012
panic(cpu 3 caller 0xffffff7f90bdcee0): "afpfs_getnewvnode: orphaned vnode (data)"@/SourceCache/afpfs/afpfs-594.2/Sources/afpfs_vfsutils.c:176
Backtrace (CPU 3), Frame : Return Address
0xffffff816f1eb200 : 0xffffff800e81d626
0xffffff816f1eb270 : 0xffffff7f90bdcee0
0xffffff816f1eb330 : 0xffffff7f90be45e0
0xffffff816f1eb3c0 : 0xffffff7f90bed065
0xffffff816f1eb490 : 0xffffff800e9137df
0xffffff816f1eb4e0 : 0xffffff800e909fe1
0xffffff816f1eb520 : 0xffffff800e8d9795
0xffffff816f1ebd80 : 0xffffff800e8d9dfc
0xffffff816f1ebf50 : 0xffffff800ebe182a
0xffffff816f1ebfb0 : 0xffffff800e8ced33
Kernel Extensions in backtrace:
com.apple.filesystems.afpfs(10.0)[B0A45DB0-315A-34C2-B9D2-4BBAEDF8775C]@0xffffff7f90bc40000xffffff7f90c12fff
dependency: com.apple.security.SecureRemotePassword(1.0)[F63E4A18-4AEE-36EE-9881-0F4F437DE8FE]@0xffffff7f90bb3000

BSD process name corresponding to current thread: Finder

Mac OS version:
12C60

Kernel version:
Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64
Kernel UUID: 69A5853F-375A-3EF4-9247-478FD0247333
Kernel slide: 0x000000000e600000
Kernel text base: 0xffffff800e800000
System model name: iMac12,2 (Mac-942B59F58194171B)

System uptime in nanoseconds: 518133511989324
last loaded kext at 511377933142110: com.apple.driver.AppleUSBCDC 4.1.22 (addr 0xffffff7f90c8f000, size 16384)
last unloaded kext at 511438013059915: com.apple.driver.AppleUSBCDC 4.1.22 (addr 0xffffff7f90c8f000, size 12288)
loaded kexts:
foo.tap 1.0
com.hzsystems.terminus.driver 4
com.iospirit.driver.rbiokithelper 1.20
com.apple.filesystems.afpfs 10.0
com.apple.nke.asp_tcp 7.0.0
com.apple.filesystems.smbfs 1.8
com.apple.driver.AppleHWSensor 1.9.5d0
com.apple.driver.AppleBluetoothMultitouch 75.15
com.apple.filesystems.autofs 3.0
com.apple.iokit.IOBluetoothSerialManager 4.0.9f33
com.apple.driver.AudioAUUC 1.60
com.apple.driver.AppleHDA 2.3.1f2
com.apple.driver.AGPM 100.12.69
com.apple.driver.AppleMikeyHIDDriver 122
com.apple.driver.AppleSMCPDRC 1.0.0
com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport 4.0.9f33
com.apple.driver.AppleSMCLMU 2.0.2d0
com.apple.driver.AppleUSBDisplays 353
com.apple.driver.AppleIRController 4000
com.apple.iokit.IOUserEthernet 1.0.0d1
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.ApplePolicyControl 3.2.11
com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
com.apple.driver.AppleMikeyDriver 2.3.1f2
com.apple.driver.AppleBacklight 170.2.3
com.apple.driver.AppleIntelHD3000Graphics 8.0.0
com.apple.driver.AppleUpstreamUserClient 3.5.10
com.apple.driver.AppleMCCSControl 1.0.33
com.apple.kext.AMDFramebuffer 8.0.0
com.apple.AMDRadeonAccelerator 1.0.0
com.apple.driver.AppleLPC 1.6.0
com.apple.driver.AppleIntelSNBGraphicsFB 8.0.0
com.apple.iokit.SCSITaskUserClient 3.5.1
com.apple.driver.AppleUSBCardReader 3.1.0
com.apple.driver.Oxford_Semi 3.1.0
com.apple.driver.XsanFilter 404
com.apple.iokit.IOAHCIBlockStorage 2.2.2
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.BootCache 34
com.apple.driver.AppleUSBHub 5.2.5
com.apple.driver.AirPort.Atheros40 600.70.23
com.apple.driver.AppleFWOHCI 4.9.6
com.apple.iokit.AppleBCM5701Ethernet 3.2.5b3
com.apple.driver.AppleAHCIPort 2.4.1
com.apple.driver.AppleUSBEHCI 5.4.0
com.apple.driver.AppleEFINVRAM 1.6.1
com.apple.driver.AppleACPIButtons 1.6
com.apple.driver.AppleRTC 1.5
com.apple.driver.AppleHPET 1.7
com.apple.driver.AppleSMBIOS 1.9
com.apple.driver.AppleACPIEC 1.6
com.apple.driver.AppleAPIC 1.6
com.apple.driver.AppleIntelCPUPowerManagementClient 196.0.0
com.apple.nke.applicationfirewall 4.0.39
com.apple.security.quarantine 2
com.apple.driver.AppleIntelCPUPowerManagement 196.0.0
com.apple.security.SecureRemotePassword 1.0
com.apple.driver.AppleBluetoothHIDKeyboard 165.5
com.apple.driver.AppleHIDKeyboard 165.5
com.apple.driver.IOBluetoothHIDDriver 4.0.9f33
com.apple.driver.AppleMultitouchDriver 235.28
com.apple.kext.triggers 1.0
com.apple.iokit.IOSerialFamily 10.0.6
com.apple.driver.DspFuncLib 2.3.1f2
com.apple.iokit.AppleBluetoothHCIControllerUSBTransport 4.0.9f33
com.apple.iokit.IOFireWireIP 2.2.5
com.apple.driver.AppleUSBAudio 2.9.0f6
com.apple.driver.AppleHDAController 2.3.1f2
com.apple.iokit.IOHDAFamily 2.3.1f2
com.apple.iokit.IOAudioFamily 1.8.9fc10
com.apple.kext.OSvKernDSPLib 1.6
com.apple.iokit.IOSurface 86.0.3
com.apple.iokit.IOBluetoothFamily 4.0.9f33
com.apple.driver.IOPlatformPluginLegacy 1.0.0
com.apple.driver.AppleSMBusPCI 1.0.10d0
com.apple.driver.AppleGraphicsControl 3.2.11
com.apple.driver.AppleBacklightExpert 1.0.4
com.apple.driver.AppleThunderboltEDMSink 1.1.8
com.apple.driver.AppleThunderboltEDMSource 1.1.8
com.apple.driver.AppleSMC 3.1.4d2
com.apple.driver.AppleSMBusController 1.0.10d0
com.apple.iokit.IOAcceleratorFamily 19.0.26
com.apple.iokit.IONDRVSupport 2.3.5
com.apple.kext.AMD6000Controller 8.0.0
com.apple.kext.AMDSupport 8.0.0
com.apple.driver.IOPlatformPluginFamily 5.2.0d16
com.apple.iokit.IOGraphicsFamily 2.3.5
com.apple.iokit.IOUSBHIDDriver 5.2.5
com.apple.driver.AppleThunderboltDPOutAdapter 1.8.5
com.apple.driver.AppleThunderboltDPInAdapter 1.8.5
com.apple.driver.AppleThunderboltDPAdapterFamily 1.8.5
com.apple.driver.AppleThunderboltPCIDownAdapter 1.2.5
com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.5.1
com.apple.iokit.IOBDStorageFamily 1.7
com.apple.iokit.IODVDStorageFamily 1.7.1
com.apple.iokit.IOCDStorageFamily 1.7.1
com.apple.iokit.IOSCSIBlockCommandsDevice 3.5.1
com.apple.iokit.IOUSBMassStorageClass 3.5.0
com.apple.iokit.IOAHCISerialATAPI 2.5.0
com.apple.iokit.IOFireWireSerialBusProtocolTransport 2.1.1
com.apple.iokit.IOSCSIArchitectureModelFamily 3.5.1
com.apple.iokit.IOFireWireSBP2 4.2.0
com.apple.driver.AppleUSBMergeNub 5.2.5
com.apple.driver.AppleUSBComposite 5.2.5
com.apple.driver.AppleThunderboltNHI 1.6.0
com.apple.iokit.IOThunderboltFamily 2.1.1
com.apple.iokit.IOUSBUserClient 5.2.5
com.apple.iokit.IO80211Family 500.15
com.apple.iokit.IOFireWireFamily 4.5.5
com.apple.iokit.IOEthernetAVBController 1.0.2b1
com.apple.iokit.IONetworkingFamily 3.0
com.apple.iokit.IOAHCIFamily 2.2.1
com.apple.iokit.IOUSBFamily 5.4.0
com.apple.driver.AppleEFIRuntime 1.6.1
com.apple.iokit.IOHIDFamily 1.8.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.sandbox 220
com.apple.kext.AppleMatch 1.0.0d1
com.apple.security.TMSafetyNet 7
com.apple.driver.DiskImages 344
com.apple.iokit.IOStorageFamily 1.8
com.apple.driver.AppleKeyStore 28.21
com.apple.driver.AppleACPIPlatform 1.6
com.apple.iokit.IOPCIFamily 2.7.2
com.apple.iokit.IOACPIFamily 1.4
com.apple.kec.corecrypto 1.0

Also der Rechner kommt nach dem Einschalten nur noch bis zum weißen Bildschirm?

Verdacht auf defekte Platte...

Das mit der Platte könnte sein, Apple hat da ein Tauschporgramm aufgelegt, für iMacs mit bestimmten Seagate-Platten schau mal ob Deiner dabei ist, ach das geht ja nicht mehr. Haste evtl. einen Boot-Stick?
http://www.apple.com/de/support/imac-harddrive/

Unsere Aufzeichnungen zeigen, dass dieser iMac über eine Seagate-Festplatte verfügt, die nicht betroffen ist. Sie müssen derzeit keine weiteren Maßnahmen ergreifen.

Nach einer halben Stunde Stromlos geht er wieder nur kommt kein Startton mehr.