Freezes on startup about once a week...

I have a Mac Pro 2,1 quad 2.66 that freezes on the gray screen with the apple logo about once a week or so. When it crashes the progress wheel appears and starts rotating under the apple logo. After that the the progress wheel will just stop and the machine will just sit there. Sometimes it attempts to restart itself but the same thing will happen. Otherwise, the machine operates perfectly with no other anomalies. Most start-ups are successful. Any thoughts?

This issue can be caused by the presence of leftover files in the Firefox program folder (defaults\pref) like a file firefox.js that overrides the update URL with a wrong link.
Do a clean reinstall and be sure to remove the Firefox program folder to remove the file(s) that cause the problem.
See:
* [/questions/826858]

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    com.apple.driver.AppleMCCSControl          1.0.20
    com.apple.driver.AppleIntelPenrynProfile          17
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
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    com.apple.driver.AppleHDA          2.0.5f14
    com.apple.driver.AudioIPCDriver          1.1.6
    com.apple.driver.AppleLPC          1.5.1
    com.apple.driver.AppleBacklight          170.0.46
    com.apple.iokit.AppleYukon2          3.2.1b1
    com.apple.driver.AirPortBrcm43224          428.42.4
    com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.0a1
    com.apple.driver.AppleIRController          303.8
    com.apple.iokit.SCSITaskUserClient          2.6.8
    com.apple.iokit.IOAHCIBlockStorage          1.6.4
    com.apple.driver.AppleFWOHCI          4.7.3
    com.apple.driver.AppleAHCIPort          2.1.7
    com.apple.driver.AppleIntelPIIXATA          2.5.1
    com.apple.driver.AppleUSBHub          4.2.4
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    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.driver.AppleEFINVRAM          1.4.0
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    com.apple.driver.AppleUSBUHCI          4.2.0
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    com.apple.driver.AppleHPET          1.5
    com.apple.driver.AppleACPIButtons          1.3.6
    com.apple.driver.AppleSMBIOS          1.7
    com.apple.driver.AppleACPIEC          1.3.6
    com.apple.driver.AppleAPIC          1.4
    com.apple.driver.AppleIntelCPUPowerManagementClient          142.6.0
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    com.apple.security.quarantine          0
    com.apple.nke.applicationfirewall          2.1.14
    com.apple.driver.AppleIntelCPUPowerManagement          142.6.0
    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          74.2
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    com.apple.iokit.IOSerialFamily          10.0.3
    com.apple.driver.DspFuncLib          2.0.5f14
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    com.apple.kext.OSvKernDSPLib          1.3
    com.apple.driver.AppleBacklightExpert          1.0.1
    com.apple.nvidia.nv50hal          6.3.6
    com.apple.NVDAResman          6.3.6
    com.apple.iokit.IONDRVSupport          2.2.1
    com.apple.driver.AppleHDAController          2.0.5f14
    com.apple.iokit.IOGraphicsFamily          2.2.1
    com.apple.iokit.IOHDAFamily          2.0.5f14
    com.apple.iokit.IO80211Family          320.1
    com.apple.driver.IOPlatformPluginFamily          4.7.0a1
    com.apple.iokit.IOFireWireIP          2.0.3
    com.apple.iokit.IONetworkingFamily          1.10
    com.apple.driver.AppleSMC          3.1.0d5
    com.apple.iokit.AppleProfileFamily          41
    com.apple.driver.BroadcomUSBBluetoothHCIController          2.4.5f3
    com.apple.driver.AppleUSBBluetoothHCIController          2.4.5f3
    com.apple.iokit.IOBluetoothFamily          2.4.5f3
    com.apple.driver.AppleUSBHIDMouse          162
    com.apple.driver.AppleHIDMouse          162
    com.apple.driver.AppleUSBHIDKeyboard          141.5
    com.apple.iokit.IOUSBHIDDriver          4.2.0
    com.apple.driver.AppleHIDKeyboard          141.5
    com.apple.iokit.IOSCSIBlockCommandsDevice          2.6.8
    com.apple.iokit.IOUSBMassStorageClass          2.6.7
    com.apple.driver.AppleUSBMergeNub          4.2.4
    com.apple.driver.AppleUSBComposite          3.9.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          2.6.8
    com.apple.iokit.IOBDStorageFamily          1.6
    com.apple.iokit.IODVDStorageFamily          1.6
    com.apple.iokit.IOCDStorageFamily          1.6.1
    com.apple.driver.XsanFilter          402.1
    com.apple.iokit.IOATAPIProtocolTransport          2.5.1
    com.apple.iokit.IOSCSIArchitectureModelFamily          2.6.8
    com.apple.iokit.IOFireWireFamily          4.2.6
    com.apple.iokit.IOAHCIFamily          2.0.6
    com.apple.iokit.IOATAFamily          2.5.1
    com.apple.iokit.IOUSBUserClient          4.2.4
    com.apple.iokit.IOUSBFamily          4.2.4
    com.apple.driver.AppleEFIRuntime          1.4.0
    com.apple.iokit.IOHIDFamily          1.6.6
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.TMSafetyNet          6
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.driver.DiskImages          289.1
    com.apple.iokit.IOStorageFamily          1.6.3
    com.apple.driver.AppleACPIPlatform          1.3.6
    com.apple.iokit.IOPCIFamily          2.6.5
    com.apple.iokit.IOACPIFamily          1.3.0
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    Graphics: NVIDIA GeForce 8800 GS, NVIDIA GeForce 8800 GS, PCIe, 512 MB
    Memory Module: global_name
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8C), Broadcom BCM43xx 1.0 (5.10.131.42.4)
    Bluetooth: Version 2.4.5f3, 2 service, 19 devices, 1 incoming serial ports
    Network Service: Ethernet, Ethernet, en0
    Network Service: AirPort, AirPort, en1
    Serial ATA Device: ST3500418ASQ, 465.76 GB
    Parallel ATA Device: MATSHITADVD-R   UJ-875
    USB Device: Keyboard Hub, 0x05ac  (Apple Inc.), 0x1006, 0xfa400000 / 2
    USB Device: Apple Optical USB Mouse, 0x05ac  (Apple Inc.), 0x0304, 0xfa410000 / 4
    USB Device: Apple Keyboard, 0x05ac  (Apple Inc.), 0x0220, 0xfa420000 / 3
    USB Device: Built-in iSight, 0x05ac  (Apple Inc.), 0x8502, 0xfd400000 / 3
    USB Device: d2 Quadra v3, 0x059f  (LaCie), 0x104c, 0xfd100000 / 2
    USB Device: IR Receiver, 0x05ac  (Apple Inc.), 0x8242, 0x5d100000 / 2
    USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x1a100000 / 2
    USB Device: Bluetooth USB Host Controller, 0x05ac  (Apple Inc.), 0x820f, 0x1a110000 / 3

    See
    Technical Note TN2063: Understanding and Debugging Kernel Panics,
    Mac OS X Kernel Panic FAQ,
    Resolving Kernel Panics,
    How to troubleshoot a kernel panic, and
    Tutorial: Avoiding and eliminating Kernel panics for more details.

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