Help please - occasional shut-down after sleep & kernel panic

Hi all.
I have an intermittent problem here with an iMac 24in 2.66Ghz Intel Core 2 Duo model. This iMac was bought refurbished from the Apple store about 6 weeks ago.
About once a week, after putting the iMac to sleep, I come back to it later to find it has shut down. The only way to restart is to unplug from the wall and then plug in and switch on as normal.
This has happened on three occasions in the last couple of weeks, and by looking in System/Library/Logs/Diagnostic Reports I found what looks like a record of a kernel panic:
Interval Since Last Panic Report: 212782 sec
Panics Since Last Report: 1
Anonymous UUID: 78A693FE-D742-4CE4-8B70-71AEA8969BD7
Mon Nov 2 09:06:27 2009
panic(cpu 0 caller 0x1153324): "pmExitHaltToOff: CPU 1 not in LCPU_HALT(5)"@/SourceCache/AppleIntelCPUPowerManagement/AppleIntelCPUPowerManag ement-90/cstateCPU.c:2068
Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x5877bcc8 : 0x21acfa (0x5ce650 0x5877bcfc 0x223156 0x0)
0x5877bd18 : 0x1153324 (0x11603ac 0x1 0x5 0x120)
0x5877bd58 : 0x2aeb5d (0x5279e0a4 0x0 0x5877bd88 0x4fe457)
0x5877bd88 : 0xef36c8 (0xef31d2 0x3 0x0 0x221bd7)
0x5877bda8 : 0xef6b4e (0x814b000 0x2 0x0 0x8156080)
0x5877bdc8 : 0x55c367 (0x817ac80 0x860720 0xffffffff 0x0)
0x5877be18 : 0x571d45 (0x814b000 0x15 0x5877be48 0x4fa0a0)
0x5877be78 : 0x53db00 (0x7fc3400 0x4 0x1d 0x2)
0x5877beb8 : 0x53dbe1 (0x7fc3400 0x9647700 0x5877bee8 0x80e4e00)
0x5877bed8 : 0x5433ef (0x7fc3400 0x88de480 0x0 0x5404c5)
0x5877bf28 : 0x53af2f (0x7fc3400 0x88de480 0x80e4e00 0x57192e)
0x5877bf58 : 0x54707a (0x80e4e00 0x1 0x5877bf88 0x546c31)
0x5877bf88 : 0x5474d4 (0x8129440 0x8f29000 0x58cfdc 0xffffffff)
0x5877bfc8 : 0x29c68c (0x8129440 0x0 0x10 0x8e6eba0)
Kernel Extensions in backtrace (with dependencies):
com.apple.driver.AppleIntelCPUPowerManagement(90.0.0)@0x1151000->0x1168fff
com.apple.driver.AppleACPIPlatform(1.3)@0xee9000->0xf29fff
dependency: com.apple.iokit.IOACPIFamily(1.3.0)@0x91e000
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x932000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
10B504
Kernel version:
Darwin Kernel Version 10.0.0: Fri Jul 31 22:47:34 PDT 2009; root:xnu-1456.1.25~1/RELEASE_I386
System model name: iMac9,1 (Mac-F2218FA9)
System uptime in nanoseconds: 212722738568754
unloaded kexts:
com.apple.driver.AppleUSBEthernetHost 2.0.0 (addr 0x58772000, size 0x16384) - last unloaded 123544687746330
loaded kexts:
com.apple.filesystems.webdav 1.6 - last loaded 201550497698325
com.apple.driver.AppleHWSensor 1.9.2d0
com.apple.driver.AppleMikeyHIDDriver 1.1.7
com.apple.driver.AppleHDA 1.7.4a1
com.apple.driver.AppleMikeyDriver 1.7.4a1
com.apple.driver.AppleUpstreamUserClient 3.0.5
com.apple.driver.AppleLPC 1.4.6
com.apple.driver.AGPM 100.8.15
com.apple.driver.AppleIRController 161
com.apple.filesystems.autofs 2.1.0
com.apple.driver.AppleIntelPenrynProfile 17
com.apple.driver.ACPISMCPlatformPlugin 3.4.0a20
com.apple.driver.NVSMU 1.1.7
com.apple.GeForce 6.0.2
com.apple.DontSteal_Mac_OSX 7.0.0
com.apple.iokit.CHUDUtils 201
com.apple.iokit.CHUDProf 212
com.apple.driver.AppleBacklight 170.0.2
com.apple.driver.AudioIPCDriver 1.1.0
com.apple.iokit.SCSITaskUserClient 2.5.1
com.apple.BootCache 31
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.driver.AppleFWOHCI 4.3.4
com.apple.nvenet 1.0.58
com.apple.driver.AppleUSBHub 3.7.8
com.apple.iokit.IOAHCIBlockStorage 1.6.0
com.apple.driver.AppleUSBEHCI 3.7.5
com.apple.driver.AirPortBrcm43xx 410.91.20
com.apple.driver.AppleAHCIPort 2.0.0
com.apple.driver.AppleUSBOHCI 3.7.5
com.apple.driver.AppleHPET 1.4
com.apple.driver.AppleEFINVRAM 1.3.0
com.apple.driver.AppleRTC 1.3
com.apple.driver.AppleACPIButtons 1.3
com.apple.driver.AppleSMBIOS 1.4
com.apple.driver.AppleACPIEC 1.3
com.apple.driver.AppleAPIC 1.4
com.apple.driver.AppleIntelCPUPowerManagementClient 90.0.0
com.apple.security.sandbox 0
com.apple.security.quarantine 0
com.apple.nke.applicationfirewall 2.0.11
com.apple.driver.AppleIntelCPUPowerManagement 90.0.0
com.apple.driver.DspFuncLib 1.7.4a1
com.apple.driver.AppleProfileReadCounterAction 17
com.apple.driver.AppleSMBusController 1.0.2d0
com.apple.driver.AppleHDAController 1.7.4a1
com.apple.iokit.IOHDAFamily 1.7.4a1
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.nvidia.nv50hal 6.0.2
com.apple.iokit.IOFireWireIP 2.0.3
com.apple.driver.IOPlatformPluginFamily 3.4.0a20
com.apple.NVDAResman 6.0.2
com.apple.iokit.IOSurface 73.0
com.apple.iokit.IOBluetoothSerialManager 2.2.1f7
com.apple.iokit.IOSerialFamily 10.0.2
com.apple.driver.AppleSMC 3.0.1d2
com.apple.driver.AppleSMBusPCI 1.0.2d0
com.apple.iokit.CHUDKernLib 203
com.apple.iokit.IONDRVSupport 2.0
com.apple.iokit.IOGraphicsFamily 2.0
com.apple.iokit.IOAudioFamily 1.7.0fc16
com.apple.kext.OSvKernDSPLib 1.3
com.apple.iokit.AppleProfileFamily 40
com.apple.driver.BroadcomUSBBluetoothHCIController 2.2.1f7
com.apple.driver.AppleUSBBluetoothHCIController 2.2.1f7
com.apple.iokit.IOBluetoothFamily 2.2.1f7
com.apple.driver.AppleUSBHIDMouse 1.3.0f1
com.apple.driver.AppleHIDMouse 1.3.0f1
com.apple.iokit.IOUSBHIDDriver 3.7.5
com.apple.driver.AppleUSBMergeNub 3.7.5
com.apple.driver.AppleUSBComposite 3.7.5
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.5.1
com.apple.iokit.IOBDStorageFamily 1.6
com.apple.iokit.IODVDStorageFamily 1.6
com.apple.iokit.IOCDStorageFamily 1.6
com.apple.iokit.IOFireWireFamily 4.1.7
com.apple.driver.XsanFilter 402.1
com.apple.iokit.IOAHCISerialATAPI 1.2.0
com.apple.iokit.IOSCSIArchitectureModelFamily 2.5.1
com.apple.iokit.IOUSBUserClient 3.7.5
com.apple.iokit.IO80211Family 300.20
com.apple.iokit.IONetworkingFamily 1.8
com.apple.iokit.IOAHCIFamily 2.0.0
com.apple.iokit.IOUSBFamily 3.7.8
com.apple.driver.AppleEFIRuntime 1.3.0
com.apple.iokit.IOHIDFamily 1.6.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.kext.AppleMatch 1.0.0d1
com.apple.security.TMSafetyNet 6
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: iMac9,1, BootROM IM91.008D.B08, 2 processors, Intel Core 2 Duo, 2.66 GHz, 4 GB, SMC 1.45f0
Graphics: NVIDIA GeForce 9400, NVIDIA GeForce 9400, PCI, 256 MB
Memory Module: global_name
AirPort: spairportwireless_card_type_airportextreme (0x14E4, 0x8E), Broadcom BCM43xx 1.0 (5.10.91.19)
Bluetooth: Version 2.2.1f7, 2 service, 1 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Serial ATA Device: WDC WD6400AAKS-40H2B0, 596.17 GB
Serial ATA Device: OPTIARC DVD RW AD-5670S
USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8502, 0x24400000
USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0x04500000
USB Device: Hub in Apple Pro Keyboard, 0x05ac (Apple Inc.), 0x1002, 0x04300000
USB Device: Apple Optical USB Mouse, 0x05ac (Apple Inc.), 0x0304, 0x04320000
USB Device: Apple Pro Keyboard, 0x05ac (Apple Inc.), 0x0205, 0x04310000
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06100000
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8215, 0x06110000
Since this last one I have reset the PRAM/NVRAM and updated to OS X 10.6.2. Is this likely to help or is there a more fundamental problem here?
Thanks for any help on this.

HI,
"AppleIntelCPUPowerManagement-"
First, try resetting the SMC. (System Management Controller)
http://support.apple.com/kb/HT1543
Considering this iMac is well within the one year limited warranty, I'd take it back if resetting the SMC does not work. You should not have to trouble shoot kernel panics whether it's refurbished or not but read here for help to resolve kernel panics... something might help.
http://www.thexlab.com/faqs/kernelpanics.html
If you have installed any 3rd party software / hardware, uninstall and try using the iMac to see if it's stable.
Carolyn

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Attachments:
PowerHibernateNever.jpg ‏59 KB

Help please - occasional shut-down after sleep & kernel panic

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