On an iMAC running OSX10.8.4, after a "sleep" it wakes to white screen, no response to any commands. Have to reboot. Any suggestions?

About half the time when I allow my iMAC to go into sleep mode it wakes to a blank white screen. No sequence of commands will get it out of white screen. I have to re-boot from start and then it gives an error dialog box "you shut down because of a problem". Is there a bug in 10.8.4, or am I missing something?

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, or by corruption of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and Wi-Fi on certain iMacs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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Mon Aug 20 10:11:55 2012
panic(cpu 4 caller 0xffffff802ceb7b95): Kernel trap at 0x0000000000000000, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x0000000000000000, CR3: 0x000000002f833000, CR4: 0x00000000000606e0
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RSP: 0xffffff811d5a3df8, RBP: 0xffffff811d5a3e40, RSI: 0xffffff803ec11180, RDI: 0xffffff80473e9400
R8: 0x000000000000005f, R9: 0x00000000000003ff, R10: 0xffffffffffffffff, R11: 0x00000000ffffffff
R12: 0xffffff80473e9400, R13: 0xffffff803fc73400, R14: 0xffffff80473e9400, R15: 0xffffff803fc73400
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0xffffff811d5a3a90 : 0xffffff802ce1d5f6
0xffffff811d5a3b00 : 0xffffff802ceb7b95
0xffffff811d5a3cd0 : 0xffffff802cece4ad
0xffffff811d5a3cf0 : 0x0
0xffffff811d5a3e40 : 0xffffff802d23b4ac
0xffffff811d5a3e60 : 0xffffff802d2364a8
0xffffff811d5a3eb0 : 0xffffff802d2401d4
0xffffff811d5a3ef0 : 0xffffff802d2402af
0xffffff811d5a3f30 : 0xffffff802d245b8a
0xffffff811d5a3f80 : 0xffffff802d245cb9
0xffffff811d5a3fb0 : 0xffffff802ceb2677
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12A269
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Darwin Kernel Version 12.0.0: Sun Jun 24 23:00:16 PDT 2012; root:xnu-2050.7.9~1/RELEASE_X86_64
Kernel UUID: 8D5F8EF3-9D12-384B-8070-EF2A49C45D24
Kernel slide:     0x000000002cc00000
Kernel text base: 0xffffff802ce00000
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System uptime in nanoseconds: 10105557835597
last loaded kext at 9488511184550: com.apple.filesystems.smbfs    1.8 (addr 0xffffff7faf1a6000, size 229376)
last unloaded kext at 325944593077: com.apple.driver.AppleUSBUHCI    5.1.5 (addr 0xffffff7fad768000, size 65536)
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com.avatron.AVExFramebuffer    1.6.4
com.avatron.AVExVideo    1.6.4
com.apple.filesystems.smbfs    1.8
com.apple.driver.AppleBluetoothMultitouch    75.15
com.apple.driver.AppleHWSensor    1.9.5d0
com.apple.driver.AudioAUUC    1.60
com.apple.driver.AGPM    100.12.69
com.apple.iokit.IOBluetoothSerialManager    4.0.9f8
com.apple.driver.AppleMikeyHIDDriver    122
com.apple.driver.AppleHDA    2.3.0f2
com.apple.filesystems.autofs    3.0
com.apple.iokit.IOUserEthernet    1.0.0d1
com.apple.Dont_Steal_Mac_OS_X    7.0.0
com.apple.driver.AppleMikeyDriver    2.3.0f2
com.apple.driver.AppleUpstreamUserClient    3.5.10
com.apple.driver.SMCMotionSensor    3.0.2d6
com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport    4.0.9f8
com.apple.driver.ApplePolicyControl    3.2.6
com.apple.driver.AppleSMCLMU    2.0.2d0
com.apple.driver.AppleSMCPDRC    1.0.0
com.apple.driver.AppleMCCSControl    1.0.33
com.apple.kext.AMDFramebuffer    8.0.0
com.apple.AMDRadeonAccelerator    1.0.0
com.apple.driver.AppleMuxControl    3.2.6
com.apple.driver.AppleIntelHD3000Graphics    8.0.0
com.apple.driver.AppleIntelSNBGraphicsFB    8.0.0
com.apple.driver.ACPI_SMC_PlatformPlugin    1.0.0
com.apple.driver.AppleLPC    1.6.0
com.apple.driver.AppleUSBTCButtons    235.4
com.apple.driver.AppleIRController    320.15
com.apple.driver.AppleUSBTCKeyboard    235.4
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
com.apple.BootCache    34
com.apple.iokit.SCSITaskUserClient    3.5.1
com.apple.driver.XsanFilter    404
com.apple.driver.AppleUSBHub    5.1.6
com.apple.iokit.IOAHCIBlockStorage    2.2.0
com.apple.driver.AppleSDXC    1.2.2
com.apple.driver.AirPort.Brcm4331    600.15.20
com.apple.iokit.AppleBCM5701Ethernet    3.2.5b3
com.apple.driver.AppleFWOHCI    4.9.5
com.apple.driver.AppleAHCIPort    2.4.0
com.apple.driver.AppleUSBEHCI    5.1.5
com.apple.driver.AppleEFINVRAM    1.6.1
com.apple.driver.AppleSmartBatteryManager    161.0.0
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.driver.IOBluetoothHIDDriver    4.0.9f8
com.apple.driver.AppleMultitouchDriver    235.27
com.apple.iokit.IOSerialFamily    10.0.6
com.apple.driver.DspFuncLib    2.3.0f2
com.apple.iokit.IOAudioFamily    1.8.9fc9
com.apple.kext.OSvKernDSPLib    1.6
com.apple.kext.triggers    1.0
com.apple.iokit.IOSurface    86.0.2
com.apple.iokit.IOBluetoothFamily    4.0.9f8
com.apple.driver.AppleHDAController    2.3.0f2
com.apple.iokit.IOHDAFamily    2.3.0f2
com.apple.iokit.AppleBluetoothHCIControllerUSBTransport    4.0.9f8
com.apple.driver.AppleSMBusController    1.0.10d0
com.apple.iokit.IOAcceleratorFamily    19.0.26
com.apple.driver.AppleBacklightExpert    1.0.4
com.apple.driver.AppleGraphicsControl    3.2.6
com.apple.iokit.IONDRVSupport    2.3.4
com.apple.driver.AppleSMC    3.1.3d11
com.apple.driver.IOPlatformPluginLegacy    1.0.0
com.apple.driver.AppleSMBusPCI    1.0.10d0
com.apple.driver.IOPlatformPluginFamily    5.2.0d16
com.apple.kext.AMD6000Controller    8.0.0
com.apple.kext.AMDSupport    8.0.0
com.apple.iokit.IOGraphicsFamily    2.3.4
com.apple.iokit.IOFireWireIP    2.2.5
com.apple.driver.AppleThunderboltDPInAdapter    1.8.5
com.apple.driver.AppleThunderboltDPAdapterFamily    1.8.5
com.apple.driver.AppleThunderboltPCIDownAdapter    1.2.5
com.apple.driver.AppleUSBMultitouch    235.7
com.apple.iokit.IOUSBHIDDriver    5.0.0
com.apple.driver.AppleUSBMergeNub    5.1.5
com.apple.driver.AppleUSBComposite    5.0.0
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.IOAHCISerialATAPI    2.5.0
com.apple.iokit.IOSCSIArchitectureModelFamily    3.5.1
com.apple.driver.AppleThunderboltNHI    1.6.0
com.apple.iokit.IOThunderboltFamily    2.0.3
com.apple.iokit.IOUSBUserClient    5.0.0
com.apple.iokit.IO80211Family    500.15
com.apple.iokit.IOEthernetAVBController    1.0.2b1
com.apple.iokit.IONetworkingFamily    3.0
com.apple.iokit.IOFireWireFamily    4.5.5
com.apple.iokit.IOAHCIFamily    2.2.0
com.apple.iokit.IOUSBFamily    5.1.6
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    28.18
com.apple.driver.AppleACPIPlatform    1.6
com.apple.iokit.IOPCIFamily    2.7
com.apple.iokit.IOACPIFamily    1.4
com.apple.kec.corecrypto    1.0
Model: MacBookPro8,2, BootROM MBP81.0047.B27, 4 processors, Intel Core i7, 2.2 GHz, 8 GB, SMC 1.69f3
Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In, 512 MB
Graphics: AMD Radeon HD 6750M, AMD Radeon HD 6750M, PCIe, 512 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x0198, 0x393930353432382D3035312E4130304C4620
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x0198, 0x393930353432382D3035312E4130304C4620
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xD6), Broadcom BCM43xx 1.0 (5.106.98.81.20)
Bluetooth: Version 4.0.9f8 10405, 2 service, 18 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: ST9500325ASG, 500.11 GB
Serial ATA Device: MATSHITADVD-R   UJ-8A8
USB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x8509, 0xfa200000 / 3
USB Device: hub_device, 0x0424 (SMSC), 0x2513, 0xfa100000 / 2
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0253, 0xfa120000 / 5
USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 4
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x821a, 0xfa113000 / 7
USB Device: hub_device, 0x0424 (SMSC), 0x2513, 0xfd100000 / 2
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd110000 / 3

My daughter's Macbook exhibited the same problem after upgrade to Mt. Lion. The setting for the power management (pmset) hibernate was incorrect. It was set to 5 when it should be either 0, 3, or 25. We set her's to 3 (default for Macbook) and it has been working fine ever since. As always YMMV.

On an iMAC running OSX10.8.4, after a "sleep" it wakes to white screen, no response to any commands. Have to reboot. Any suggestions?

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