Intel imac reboot quick black screen

I have an intel imac made in 2006.
I notice when I restart it, and as it is rebooting after the little spinning thing is done spinning, the screen then turns black for a half second before the Login window appears. Is that normal? Is that normal and something I just never really noticed before?

It used to be blue in the earlier OS X versions, now it is black in Lion and Mountain Lion.

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    0xffffff811454b6d0 : 0xffffff7fa0d3df1e
    0xffffff811454b790 : 0xffffff7fa0e1212d
    0xffffff811454b7d0 : 0xffffff7fa0e1218e
    0xffffff811454b840 : 0xffffff7fa1135146
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    0xffffff811454bef0 : 0xffffff7fa2875176
    0xffffff811454bf40 : 0xffffff7fa28741e7
    0xffffff811454bf60 : 0xffffff802063e25e
    0xffffff811454bfb0 : 0xffffff80206b3137
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             com.apple.driver.AppleMuxControl(3.4.5)[49FEF732-D7A3-327B-A7AA-6AC5A6E3DCFF]@0 xffffff7fa28a4000->0xffffff7fa28b6fff
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                dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7fa0c46000
                dependency: com.apple.driver.AppleGraphicsControl(3.4.5)[4A2C8548-7EF1-38A9-8817-E8CB34B8DC A6]@0xffffff7fa288b000
                dependency: com.apple.iokit.IOACPIFamily(1.4)[A35915E8-C1B0-3C0F-81DF-5515BC9002FC]@0xfffff f7fa1797000
                dependency: com.apple.iokit.IONDRVSupport(2.3.7)[6C8CFC18-75F0-3DEF-86C7-CEB2C1FD6BB1]@0xff ffff7fa0cc8000
                dependency: com.apple.iokit.IOGraphicsFamily(2.3.7)[990D1A42-DF16-3AB9-ABC1-6A88AC142244]@0 xffffff7fa0c85000
             com.apple.NVDAResman(8.1.2)[96AE69DE-8A37-39D0-B2D3-D8446A6AA670]@0xffffff7fa0c dc000->0xffffff7fa0f81fff
                dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7fa0c46000
                dependency: com.apple.iokit.IONDRVSupport(2.3.7)[6C8CFC18-75F0-3DEF-86C7-CEB2C1FD6BB1]@0xff ffff7fa0cc8000
                dependency: com.apple.iokit.IOGraphicsFamily(2.3.7)[990D1A42-DF16-3AB9-ABC1-6A88AC142244]@0 xffffff7fa0c85000
             com.apple.nvidia.gk100hal(8.1.2)[8007AA34-6789-37E9-B069-A414AA26C6B6]@0xffffff 7fa0f8d000->0xffffff7fa12befff
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                dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7fa0c46000
             com.apple.driver.AGPM(100.12.87)[621C8E31-07A5-38AC-95C9-F600FA62270B]@0xffffff 7fa2873000->0xffffff7fa2882fff
                dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7fa0c46000
                dependency: com.apple.driver.IOPlatformPluginFamily(5.3.0d51)[7B50B447-FF44-3529-9505-3F49C F1CCB4F]@0xffffff7fa17a0000
                dependency: com.apple.iokit.IONDRVSupport(2.3.7)[6C8CFC18-75F0-3DEF-86C7-CEB2C1FD6BB1]@0xff ffff7fa0cc8000
                dependency: com.apple.iokit.IOGraphicsFamily(2.3.7)[990D1A42-DF16-3AB9-ABC1-6A88AC142244]@0 xffffff7fa0c85000
    BSD process name corresponding to current thread: kernel_task
    Mac OS version:
    12E55
    Kernel version:
    Darwin Kernel Version 12.4.0: Wed May  1 17:57:12 PDT 2013; root:xnu-2050.24.15~1/RELEASE_X86_64
    Kernel UUID: 896CB1E3-AB79-3DF1-B595-549DFFDF3D36
    Kernel slide:     0x0000000020400000
    Kernel text base: 0xffffff8020600000
    System model name: MacBookPro10,1 (Mac-C3EC7CD22292981F)
    System uptime in nanoseconds: 2085445833823
    last loaded kext at 5275234850: com.apple.driver.AppleHWSensor          1.9.5d0 (addr 0xffffff7fa266d000, size 36864)
    last unloaded kext at 146616598548: com.apple.iokit.IOEthernetAVBController          1.0.2b1 (addr 0xffffff7fa17fe000, size 28672)
    loaded kexts:
    com.protech.NoSleep          1.3.3
    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.driver.AudioAUUC          1.60
    com.apple.iokit.IOBluetoothSerialManager          4.1.4f2
    com.apple.filesystems.autofs          3.0
    com.apple.filesystems.ntfs          3.10
    com.apple.driver.ApplePlatformEnabler          2.0.6d1
    com.apple.driver.AGPM          100.12.87
    com.apple.driver.X86PlatformShim          1.0.0
    com.apple.driver.AppleMikeyHIDDriver          122
    com.apple.driver.AppleHDA          2.3.7fc4
    com.apple.GeForce          8.1.2
    com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport          4.1.4f2
    com.apple.driver.AppleMikeyDriver          2.3.7fc4
    com.apple.driver.AppleUpstreamUserClient          3.5.10
    com.apple.driver.AppleLPC          1.6.0
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AppleSMCLMU          2.0.3d0
    com.apple.driver.AppleIntelHD4000Graphics          8.1.2
    com.apple.driver.AppleSMCPDRC          1.0.0
    com.apple.driver.ApplePolicyControl          3.4.5
    com.apple.driver.AppleIntelFramebufferCapri          8.1.2
    com.apple.driver.AppleMuxControl          3.4.5
    com.apple.driver.AppleMCCSControl          1.1.11
    com.apple.driver.AppleUSBTCButtons          237.1
    com.apple.driver.AppleUSBTCKeyboard          237.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          34
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCIBlockStorage          2.3.1
    com.apple.driver.AppleUSBHub          5.5.5
    com.apple.driver.AppleSDXC          1.4.2
    com.apple.driver.AirPort.Brcm4331          615.20.17
    com.apple.driver.AppleAHCIPort          2.5.2
    com.apple.driver.AppleUSBEHCI          5.5.0
    com.apple.driver.AppleUSBXHCI          5.6.0
    com.apple.driver.AppleEFINVRAM          1.7
    com.apple.driver.AppleSmartBatteryManager          161.0.0
    com.apple.driver.AppleACPIButtons          1.7
    com.apple.driver.AppleRTC          1.5
    com.apple.driver.AppleHPET          1.8
    com.apple.driver.AppleSMBIOS          1.9
    com.apple.driver.AppleACPIEC          1.7
    com.apple.driver.AppleAPIC          1.6
    com.apple.driver.AppleIntelCPUPowerManagementClient          196.0.0
    com.apple.nke.applicationfirewall          4.0.39
    com.apple.security.quarantine          2.1
    com.apple.driver.AppleIntelCPUPowerManagement          196.0.0
    com.apple.iokit.IOSerialFamily          10.0.6
    com.apple.kext.triggers          1.0
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.5
    com.apple.driver.DspFuncLib          2.3.7fc4
    com.apple.iokit.IOAudioFamily          1.8.9fc11
    com.apple.kext.OSvKernDSPLib          1.6
    com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.1.4f2
    com.apple.nvidia.gk100hal          8.1.2
    com.apple.NVDAResman          8.1.2
    com.apple.driver.AppleHDAController          2.3.7fc4
    com.apple.iokit.IOHDAFamily          2.3.7fc4
    com.apple.iokit.IOSurface          86.0.4
    com.apple.iokit.IOBluetoothFamily          4.1.4f2
    com.apple.driver.AppleSMBusPCI          1.0.11d0
    com.apple.iokit.IOAcceleratorFamily          74.5.1
    com.apple.driver.X86PlatformPlugin          1.0.0
    com.apple.driver.AppleSMC          3.1.4d2
    com.apple.driver.IOPlatformPluginFamily          5.3.0d51
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