Soon after start up, black screen saying "You must shut down"

Too often, soon after start up, I get a black screen with the stating that I must shut down the machine. Also, and perhaps related, the fan will rev up more than seems needed. I believe I saw new of a download to fix the above type problems with mac laptops, but I am having it with my imac desktop. Any suggestions?

When trying to troubleshoot problems, disconnect all external devices except your monitor, kbd & mouse. Do you experience the same problems?
May be a solution on one of these links.
Troubleshooting
The X Lab (Troubleshooting & Maintenance of OS X)
OS X Routine Maintenance & Generic Troubleshooting
Prevent Mac Disasters
Kernel Panic
Mac OS X Kernel Panic FAQ
Mac OS X Kernel Panic FAQ
Resolving Kernel Panics
 Cheers, Tom

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    Mon Oct 24 22:56:11 2011
    panic(cpu 0 caller 0xffffff80002c266d): Kernel trap at 0xffffff800024421e, type 13=general protection, registers:
    CR0: 0x000000008001003b, CR2: 0x000000010a214000, CR3: 0x000000003bbab000, CR4: 0x0000000000000660
    RAX: 0xffffff800c86bf40, RBX: 0xffffff8003b7e990, RCX: 0x0000000009000000, RDX: 0xffffff8003b7e9a0
    RSP: 0xffffff80796dbaa0, RBP: 0xffffff80796dbb80, RSI: 0x0000000000000001, RDI: 0xffffff8003b7e9a0
    R8:  0xffffff80796dbbb8, R9:  0xffffff80796dbbd8, R10: 0xffffff800086ee10, R11: 0x000000000010ba96
    R12: 0x00000000000000e0, R13: 0xffffff800bab9a4c, R14: 0x5841400000000000, R15: 0xffffff80008df9e0
    RFL: 0x0000000000010206, RIP: 0xffffff800024421e, CS:  0x0000000000000008, SS:  0x0000000000000010
    CR2: 0x000000010a214000, Error code: 0x0000000000000000, Faulting CPU: 0x0
    Backtrace (CPU 0), Frame : Return Address
    0xffffff80796db760 : 0xffffff8000220702
    0xffffff80796db7e0 : 0xffffff80002c266d
    0xffffff80796db980 : 0xffffff80002d7a1d
    0xffffff80796db9a0 : 0xffffff800024421e
    0xffffff80796dbb80 : 0xffffff800022662d
    0xffffff80796dbbb0 : 0xffffff80005f55c7
    0xffffff80796dbbd0 : 0xffffff80005f58e9
    0xffffff80796dbc00 : 0xffffff80005f4009
    0xffffff80796dbc40 : 0xffffff80005f20c6
    0xffffff80796dbc90 : 0xffffff80005e3f86
    0xffffff80796dbce0 : 0xffffff80005e15a4
    0xffffff80796dbd10 : 0xffffff80005e3f86
    0xffffff80796dbd60 : 0xffffff80005e15a4
    0xffffff80796dbd90 : 0xffffff80005e3f86
    0xffffff80796dbde0 : 0xffffff800061c667
    0xffffff80796dbe00 : 0xffffff800061ecfb
    0xffffff80796dbe10 : 0xffffff80006511fb
    0xffffff80796dbe50 : 0xffffff800029d235
    0xffffff80796dbe80 : 0xffffff8000223006
    0xffffff80796dbeb0 : 0xffffff8000214829
    0xffffff80796dbf10 : 0xffffff800021bb58
    0xffffff80796dbf70 : 0xffffff80002ae8a0
    0xffffff80796dbfb0 : 0xffffff80002d8383
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    Mac OS version:
    11C74
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    Darwin Kernel Version 11.2.0: Tue Aug  9 20:54:00 PDT 2011; root:xnu-1699.24.8~1/RELEASE_X86_64
    Kernel UUID: 59275DFA-10C0-30B3-9E26-F7B5DFB1A432
    System model name: MacBookPro5,3 (Mac-F22587C8)
    System uptime in nanoseconds: 38000354004858
    last loaded kext at 38000253952912: com.apple.driver.AppleBluetoothHIDKeyboard          152.3 (addr 0xffffff7f807ad000, size 12288)
    last unloaded kext at 37627376787746: com.apple.iokit.IOEthernetAVBController          1.0.0d5 (addr 0xffffff7f807a8000, size 20480)
    loaded kexts:
    com.parallels.filesystems.prlufs          2010.12.28
    com.parallels.kext.prl_hid_hook          7.0 14922.693916
    com.parallels.kext.prl_hypervisor          7.0 14922.693916
    com.parallels.kext.prl_usb_connect          7.0 14922.693916
    com.parallels.kext.prl_vnic          7.0 14922.693916
    com.parallels.kext.prl_netbridge          7.0 14922.693916
    at.obdev.nke.LittleSnitch          2.4.4
    com.apple.filesystems.afpfs          9.8
    com.apple.nke.asp_tcp          6.0.1
    com.apple.filesystems.udf          2.2
    com.apple.filesystems.smbfs          1.7.0
    com.apple.driver.AppleHWSensor          1.9.4d0
    com.apple.filesystems.autofs          3.0
    com.apple.driver.AudioAUUC          1.59
    com.apple.driver.AppleMikeyHIDDriver          122
    com.apple.driver.AppleHDA          2.1.3f7
    com.apple.driver.AppleMikeyDriver          2.1.3f7
    com.apple.driver.AppleUpstreamUserClient          3.5.9
    com.apple.driver.AppleMCCSControl          1.0.26
    com.apple.driver.AGPM          100.12.42
    com.apple.GeForce          7.1.2
    com.apple.driver.SMCMotionSensor          3.0.1d2
    com.apple.driver.AppleSMCLMU          2.0.1d2
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AudioIPCDriver          1.2.1
    com.apple.driver.AppleMuxControl          3.0.16
    com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.5d4
    com.apple.driver.AppleLPC          1.5.3
    com.apple.driver.AppleUSBTCButtons          225.2
    com.apple.driver.AppleUSBTCKeyboard          225.2
    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.driver.AppleUSBCardReader          3.0.1
    com.apple.iokit.SCSITaskUserClient          3.0.1
    com.apple.iokit.IOAHCIBlockStorage          2.0.1
    com.apple.driver.AppleFWOHCI          4.8.9
    com.apple.driver.AirPort.Brcm4331          512.20.18
    com.apple.driver.AppleEFINVRAM          1.5.0
    com.apple.driver.AppleUSBHub          4.5.0
    com.apple.driver.AppleRTC          1.4
    com.apple.nvenet          2.0.17
    com.apple.driver.AppleUSBOHCI          4.4.5
    com.apple.driver.AppleHPET          1.6
    com.apple.driver.AppleSmartBatteryManager          161.0.0
    com.apple.driver.AppleAHCIPort          2.2.0
    com.apple.driver.AppleUSBEHCI          4.5.0
    com.apple.driver.AppleACPIButtons          1.4
    com.apple.driver.AppleSMBIOS          1.7
    com.apple.driver.AppleACPIEC          1.4
    com.apple.driver.AppleAPIC          1.5
    com.apple.driver.AppleIntelCPUPowerManagementClient          167.0.0
    com.apple.nke.applicationfirewall          3.2.30
    com.apple.security.quarantine          1
    com.apple.driver.AppleIntelCPUPowerManagement          167.0.0
    com.apple.driver.AppleBluetoothHIDKeyboard          152.3
    com.apple.driver.AppleHIDKeyboard          152.3
    com.apple.driver.IOBluetoothHIDDriver          4.0.1f4
    com.apple.iokit.IOAVBFamily          1.0.0d22
    com.apple.iokit.IOEthernetAVBController          1.0.0d5
    com.apple.security.SecureRemotePassword          1.0
    com.apple.kext.triggers          1.0
    com.apple.driver.DspFuncLib          2.1.3f7
    com.apple.nvidia.nv50hal          7.1.2
    com.apple.NVDAResman          7.1.2
    com.apple.driver.AppleSMBusController          1.0.10d0
    com.apple.iokit.IOFireWireIP          2.2.4
    com.apple.driver.AppleHDAController          2.1.3f7
    com.apple.iokit.IOHDAFamily          2.1.3f7
    com.apple.iokit.IOSurface          80.0
    com.apple.iokit.IOBluetoothSerialManager          4.0.1f4
    com.apple.iokit.IOSerialFamily          10.0.5
    com.apple.iokit.IOAudioFamily          1.8.3fc11
    com.apple.kext.OSvKernDSPLib          1.3
    com.apple.driver.ApplePolicyControl          3.0.16
    com.apple.driver.AppleGraphicsControl          3.0.16
    com.apple.driver.AppleBacklightExpert          1.0.3
    com.apple.iokit.IONDRVSupport          2.3.2
    com.apple.iokit.IOGraphicsFamily          2.3.2
    com.apple.driver.AppleSMC          3.1.1d8
    com.apple.driver.IOPlatformPluginFamily          4.7.5d4
    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.driver.BroadcomUSBBluetoothHCIController          4.0.1f4
    com.apple.driver.AppleUSBBluetoothHCIController          4.0.1f4
    com.apple.iokit.IOBluetoothFamily          4.0.1f4
    com.apple.driver.AppleUSBMultitouch          227.1
    com.apple.iokit.IOUSBHIDDriver          4.4.5
    com.apple.iokit.IOSCSIBlockCommandsDevice          3.0.1
    com.apple.iokit.IOUSBMassStorageClass          3.0.0
    com.apple.driver.AppleUSBMergeNub          4.5.3
    com.apple.driver.AppleUSBComposite          3.9.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.0.1
    com.apple.iokit.IOBDStorageFamily          1.6
    com.apple.iokit.IODVDStorageFamily          1.7
    com.apple.iokit.IOCDStorageFamily          1.7
    com.apple.driver.XsanFilter          403
    com.apple.iokit.IOAHCISerialATAPI          2.0.1
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.0.1
    com.apple.iokit.IOFireWireFamily          4.4.5
    com.apple.iokit.IO80211Family          411.1
    com.apple.iokit.IOUSBUserClient          4.5.3
    com.apple.iokit.IONetworkingFamily          2.0
    com.apple.driver.NVSMU          2.2.9
    com.apple.driver.AppleEFIRuntime          1.5.0
    com.apple.iokit.IOAHCIFamily          2.0.7
    com.apple.iokit.IOUSBFamily          4.5.3
    com.apple.iokit.IOHIDFamily          1.7.1
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          165.3
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.DiskImages          331
    com.apple.iokit.IOStorageFamily          1.7
    com.apple.driver.AppleKeyStore          28.18
    com.apple.driver.AppleACPIPlatform          1.4
    com.apple.iokit.IOPCIFamily          2.6.7
    com.apple.iokit.IOACPIFamily          1.4

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