Run the Apple Hardware Test CD, and also check the crash log to see if there's something in particular that's going on. You may need a reinstall of your OS if there's not a hardware problem.
Fresh install.
Apps freshly installed.
AHT passes properly.
Permissions are fine, yaddi yaddah.
Interval Since Last Panic Report: 44040 sec
Panics Since Last Report: 2
Anonymous UUID: 8AE459DE-EABC-48D6-8988-C3E96AD14E88
Sat Dec 19 09:04:50 2009
panic(cpu 2 caller 0x226820): "thread_invoke: preemption_level -1, possible cause: unlocking an unlocked mutex or spinlock"@/SourceCache/xnu/xnu-1486.2.11/osfmk/kern/sched_prim.c:1471
Backtrace (CPU 2), Frame : Return Address (4 potential args on stack)
0x7abcbe28 : 0x21b2bd (0x5cf868 0x7abcbe5c 0x223719 0x0)
0x7abcbe78 : 0x226820 (0x5876cc 0xffffffff 0x587664 0x2263f2)
0x7abcbef8 : 0x226f27 (0xc2b0b98 0xc2b0b98 0x7abcbf58 0x232613)
0x7abcbf68 : 0x226f92 (0x548626 0xc4bf140 0x0 0x7a8e5000)
0x7abcbf88 : 0x5486e2 (0x548626 0xc4bf140 0xffe00847 0x7fff)
0x7abcbfc8 : 0x29d68c (0xc4bf140 0x0 0x10 0xcaa7b04)
BSD process name corresponding to current thread: kernel_task
Mac OS version:
10C2234
Kernel version:
Darwin Kernel Version 10.2.0: Tue Nov 3 23:08:29 PST 2009; root:xnu-1486.2.11~3/RELEASE_I386
System model name: iMac11,1 (Mac-F2268DAE)
System uptime in nanoseconds: 2321550239807
unloaded kexts:
com.apple.filesystems.msdosfs 1.6 (addr 0x848b6000, size 0x53248) - last unloaded 312714740159
loaded kexts:
jp.plentycom.driver.SteerMouse 4.0.1
com.microsoft.driver.MicrosoftKeyboardUSB 7.1
com.microsoft.driver.MicrosoftKeyboard 7.1
com.apple.filesystems.smbfs 1.6.0 - last loaded 1450468469076
com.apple.filesystems.autofs 2.1.0
com.apple.driver.AGPM 100.9.4
com.apple.driver.AppleHWSensor 1.9.2d0
com.apple.driver.AudioAUUC 1.2
com.apple.driver.AppleUpstreamUserClient 3.2
com.apple.driver.AppleMikeyHIDDriver 1.2.0
com.apple.kext.ATIFramebuffer 6.0.6
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleMikeyDriver 1.8.1a5
com.apple.ATIRadeonX2000 6.0.6
com.apple.driver.AudioIPCDriver 1.1.2
com.apple.driver.AppleHDA 1.8.1a5
com.apple.iokit.AppleBCM5701Ethernet 2.3.2b8
com.apple.driver.AirPort.Atheros21 421.9.5
com.apple.driver.ACPI_SMC_PlatformPlugin 4.0.1d1
com.apple.driver.AppleLPC 1.4.9
com.apple.driver.AppleBacklight 170.0.14
com.apple.driver.AppleUSBCardReader 2.5.2
com.apple.iokit.SCSITaskUserClient 2.6.1
com.apple.BootCache 31
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.iokit.IOAHCIBlockStorage 1.6.0
com.apple.driver.AppleUSBHub 3.9.0
com.apple.driver.AppleFWOHCI 4.4.3
com.apple.driver.AppleEFINVRAM 1.3.0
com.apple.driver.AppleUSBEHCI 3.9.0
com.apple.driver.AppleUSBUHCI 3.9.0
com.apple.driver.AppleAHCIPort 2.1.0
com.apple.driver.AppleACPIButtons 1.3
com.apple.driver.AppleRTC 1.3
com.apple.driver.AppleHPET 1.5
com.apple.driver.AppleSMBIOS 1.4
com.apple.driver.AppleACPIEC 1.3
com.apple.driver.AppleAPIC 1.4
com.apple.driver.AppleIntelCPUPowerManagementClient 96.0.0
com.apple.security.sandbox 0
com.apple.security.quarantine 0
com.apple.nke.applicationfirewall 2.1.11
com.apple.driver.AppleIntelCPUPowerManagement 96.0.0
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.iokit.IOSurface 74.0
com.apple.iokit.IOBluetoothSerialManager 2.2.5f6
com.apple.iokit.IOSerialFamily 10.0.3
com.apple.driver.DspFuncLib 1.8.1a5
com.apple.iokit.IOAudioFamily 1.7.2fc2
com.apple.kext.OSvKernDSPLib 1.3
com.apple.driver.AppleSMBusController 1.0.4d0
com.apple.kext.ATI4800Controller 6.0.6
com.apple.kext.ATISupport 6.0.6
com.apple.iokit.IOFireWireIP 2.0.3
com.apple.iokit.IO80211Family 310.6
com.apple.iokit.IONetworkingFamily 1.9
com.apple.iokit.AppleProfileFamily 41
com.apple.driver.AppleHDAController 1.8.1a5
com.apple.iokit.IOHDAFamily 1.8.1a5
com.apple.driver.AppleSMC 3.0.1d2
com.apple.driver.IOPlatformPluginFamily 4.0.1d1
com.apple.driver.AppleSMBusPCI 1.0.4d0
com.apple.iokit.IONDRVSupport 2.0
com.apple.iokit.IOGraphicsFamily 2.0
com.apple.driver.BroadcomUSBBluetoothHCIController 2.2.5f6
com.apple.driver.AppleUSBBluetoothHCIController 2.2.5f6
com.apple.iokit.IOBluetoothFamily 2.2.5f6
com.apple.iokit.IOUSBMassStorageClass 2.5.2
com.apple.iokit.IOSCSIBlockCommandsDevice 2.6.1
com.apple.iokit.IOUSBHIDDriver 3.9.0
com.apple.driver.AppleUSBMergeNub 3.9.0
com.apple.driver.AppleUSBComposite 3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.6.1
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 1.2.2
com.apple.iokit.IOSCSIArchitectureModelFamily 2.6.1
com.apple.iokit.IOUSBUserClient 3.9.0
com.apple.iokit.IOFireWireFamily 4.1.7
com.apple.iokit.IOUSBFamily 3.9.0
com.apple.iokit.IOAHCIFamily 2.0.2
com.apple.driver.AppleEFIRuntime 1.3.0
com.apple.iokit.IOHIDFamily 1.6.1
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.TMSafetyNet 6
com.apple.kext.AppleMatch 1.0.0d1
com.apple.driver.DiskImages 281
com.apple.iokit.IOStorageFamily 1.6
com.apple.driver.AppleACPIPlatform 1.3
com.apple.iokit.IOPCIFamily 2.6
com.apple.iokit.IOACPIFamily 1.3.0
System Profile:
Model: iMac11,1, BootROM IM111.0034.B00, 4 processors, Intel Core i7, 2.8 GHz, 8 GB, SMC 1.54f33
Graphics: ATI Radeon HD 4850, ATI Radeon HD 4850, PCIe, 512 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 2.1.9.5
Bluetooth: Version 2.2.5f6, 2 service, 0 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Serial ATA Device: ST31000528ASQ, 931.51 GB
Serial ATA Device: OPTIARC DVD RW AD-5680H
USB Device: Hub, 0x0424 (SMSC), 0x2514, 0xfd100000
USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0xfd120000
USB Device: USB-PS/2 Optical Mouse, 0x046d (Logitech Inc.), 0xc051, 0xfd140000
USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8502, 0xfd110000
USB Device: Hub, 0x0424 (SMSC), 0x2514, 0xfa100000
USB Device: Hub, 0x050d (Belkin Corporation), 0x0237, 0xfa130000
USB Device: iPhone, 0x05ac (Apple Inc.), 0x1294, 0xfa134000
USB Device: SCX-4500 Series, 0x04e8 (Samsung Electronics Co., Ltd.), 0x3426, 0xfa132000
USB Device: Natural® Ergonomic Keyboard 4000, 0x045e (Microsoft Corporation), 0x00db, 0xfa140000
USB Device: Internal Memory Card Reader, 0x05ac (Apple Inc.), 0x8403, 0xfa120000
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8215, 0xfa111000
FireWire Device: unknown_device, Unknown