Imac reboots on its own

I have a 20 inch Imac Intel. I have had the logic board and airport card replaced. Every day before and after the repairs my computer will reboot on its own. Steps I have taken so far:
1. PRAM resets
2. Testing Via TechTool (Came back fine)
3. Deleted Powermanagment in System Preference.
I have memory from Other Computer World installed. When I ran the tests from TechTool it said the memory was fine. I was wondering if anyone else's IMAC does this. If it does how did they fix it
Imac Intel 20" 2 GB Ram   Mac OS X (10.4.8)  

im just as a starter as u in macs just so u know, i did that yesterday and it fixed my isight(it was showing black). ok u unplug ALL cables, usb etc etc everything from the imac and unplug the main power cord too for like half a minute and then replug everything in and thats it i believe

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    im just as a starter as u in macs just so u know, i did that yesterday and it fixed my isight(it was showing black). ok u unplug ALL cables, usb etc etc everything from the imac and unplug the main power cord too for like half a minute and then replug everything in and thats it i believe

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    0xffffff801b813df0 : 0xffffff7f93b85fcd
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             com.apple.NVDAResman(8.1.2)[96AE69DE-8A37-39D0-B2D3-D8446A6AA670]@0xffffff7f939 d1000->0xffffff7f93c76fff
                dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f9392b000
                dependency: com.apple.iokit.IONDRVSupport(2.3.7)[6C8CFC18-75F0-3DEF-86C7-CEB2C1FD6BB1]@0xff ffff7f939bd000
                dependency: com.apple.iokit.IOGraphicsFamily(2.3.7)[990D1A42-DF16-3AB9-ABC1-6A88AC142244]@0 xffffff7f9397a000
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                dependency: com.apple.NVDAResman(8.1.2)[96AE69DE-8A37-39D0-B2D3-D8446A6AA670]@0xffffff7f939 d1000
                dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f9392b000
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    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:     0x0000000013000000
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    System uptime in nanoseconds: 15074033463761
    last loaded kext at 3498511390977: com.astrill.astrill.kext          1.0 (addr 0xffffff7f954c3000, size 32768)
    last unloaded kext at 202946162466: com.apple.driver.AppleFileSystemDriver          3.0.1 (addr 0xffffff7f95380000, size 8192)
    loaded kexts:
    com.astrill.astrill.kext          1.0
    org.virtualbox.kext.VBoxNetAdp          4.1.2
    org.virtualbox.kext.VBoxNetFlt          4.1.2
    org.virtualbox.kext.VBoxUSB          4.1.2
    org.virtualbox.kext.VBoxDrv          4.1.2
    com.symantec.kext.fw          1.0.3f5
    com.symantec.kext.filesecurity          1.4.3f19
    com.Cycling74.driver.Soundflower          1.5.2
    com.radiosilenceapp.nke.PrivateEye          1
    com.symantec.kext.ips          3.2f8
    com.symantec.kext.pf          4.2.1f7
    com.symantec.kext.internetSecurity          1.3.2f5
    com.apple.driver.AppleBluetoothMultitouch          75.19
    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.iokit.IOBluetoothSerialManager          4.1.4f2
    com.apple.driver.AGPM          100.12.87
    com.apple.driver.AppleHDA          2.3.7fc4
    com.apple.driver.AppleMikeyHIDDriver          122
    com.apple.GeForce          8.1.2
    com.apple.driver.AppleMikeyDriver          2.3.7fc4
    com.apple.driver.AppleUpstreamUserClient          3.5.10
    com.apple.driver.AudioAUUC          1.60
    com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport          4.1.4f2
    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.AppleBacklight          170.2.5
    com.apple.driver.ApplePolicyControl          3.4.5
    com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
    com.apple.driver.AppleLPC          1.6.0
    com.apple.driver.AppleMCCSControl          1.1.11
    com.apple.driver.AppleIRController          320.15
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          34
    com.apple.iokit.SCSITaskUserClient          3.5.5
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCIBlockStorage          2.3.1
    com.apple.driver.AppleUSBHub          5.5.5
    com.apple.driver.AppleRTC          1.5
    com.apple.driver.AppleFWOHCI          4.9.6
    com.apple.driver.AirPort.Brcm4331          615.20.17
    com.apple.driver.AppleAHCIPort          2.5.2
    com.apple.nvenet          2.0.19
    com.apple.driver.AppleUSBEHCI          5.5.0
    com.apple.driver.AppleUSBOHCI          5.2.5
    com.apple.driver.AppleEFINVRAM          1.7
    com.apple.driver.AppleHPET          1.8
    com.apple.driver.AppleACPIButtons          1.7
    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.driver.AppleUSBHIDKeyboard          170.2
    com.apple.driver.AppleHIDKeyboard          170.2
    com.apple.driver.IOBluetoothHIDDriver          4.1.4f2
    com.apple.driver.AppleMultitouchDriver          235.29
    com.apple.iokit.IOSerialFamily          10.0.6
    com.apple.driver.DspFuncLib          2.3.7fc4
    com.apple.nvidia.nv50hal          8.1.2
    com.apple.NVDAResman          8.1.2
    com.apple.iokit.IOFireWireIP          2.2.5
    com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.1.4f2
    com.apple.kext.triggers          1.0
    com.apple.iokit.IOAudioFamily          1.8.9fc11
    com.apple.kext.OSvKernDSPLib          1.6
    com.apple.iokit.IOSurface          86.0.4
    com.apple.iokit.IOBluetoothFamily          4.1.4f2
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.driver.AppleHDAController          2.3.7fc4
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    com.apple.driver.AppleGraphicsControl          3.4.5
    com.apple.iokit.IONDRVSupport          2.3.7
    com.apple.driver.AppleSMC          3.1.4d2
    com.apple.driver.IOPlatformPluginLegacy          1.0.0
    com.apple.driver.AppleSMBusPCI          1.0.11d0
    com.apple.driver.IOPlatformPluginFamily          5.3.0d51
    com.apple.driver.AppleSMBusController          1.0.11d0
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    com.apple.iokit.IOBDStorageFamily          1.7
    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily          1.7.1
    com.apple.iokit.IOAHCISerialATAPI          2.5.1
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.5
    com.apple.iokit.IOUSBUserClient          5.5.5
    com.apple.iokit.IOFireWireFamily          4.5.5
    com.apple.iokit.IO80211Family          530.4
    com.apple.iokit.IOAHCIFamily          2.3.1
    com.apple.iokit.IONetworkingFamily          3.0
    com.apple.iokit.IOUSBFamily          5.6.0
    com.apple.driver.NVSMU          2.2.9
    com.apple.driver.AppleEFIRuntime          1.7
    com.apple.iokit.IOHIDFamily          1.8.1
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          220.3
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.DiskImages          345
    com.apple.iokit.IOStorageFamily          1.8
    com.apple.driver.AppleKeyStore          28.21
    com.apple.driver.AppleACPIPlatform          1.7
    com.apple.iokit.IOPCIFamily          2.7.3
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.corecrypto          1.0
    Thanks for all your help

    Welcome to Apple Support Communities
    Jack1979 wrote:
    Sat Aug  3 20:19:27 2013
    panic(cpu 1 caller 0xffffff7f93a32f33): NVRM[0/2:0:0]: Read Error 0x0061002c: CFG 0x00000000 0x00000000 0x00000000, BAR0 0xd2000000 0xffffff809382d000 0x094700a1, D0, P3/4
    Backtrace (CPU 1), Frame : Return Address
    0xffffff801b813c40 : 0xffffff801321d626
    0xffffff801b813cb0 : 0xffffff7f93a32f33
    0xffffff801b813d70 : 0xffffff7f93b0712d
    0xffffff801b813db0 : 0xffffff7f93d046b2
    0xffffff801b813dd0 : 0xffffff7f93ada238
    0xffffff801b813df0 : 0xffffff7f93b85fcd
    0xffffff801b813e70 : 0xffffff7f93a18141
    0xffffff801b813f30 : 0xffffff7f939d7975
    0xffffff801b813f60 : 0xffffff801323e25e
    0xffffff801b813fb0 : 0xffffff80132b3137
          Kernel Extensions in backtrace:
             com.apple.NVDAResman(8.1.2)[96AE69DE-8A37-39D0-B2D3-D8446A6AA670]@0xffffff7f939 d1000->0xffffff7f93c76fff
                dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f9392b000
                dependency: com.apple.iokit.IONDRVSupport(2.3.7)[6C8CFC18-75F0-3DEF-86C7-CEB2C1FD6BB1]@0xff ffff7f939bd000
                dependency: com.apple.iokit.IOGraphicsFamily(2.3.7)[990D1A42-DF16-3AB9-ABC1-6A88AC142244]@0 xffffff7f9397a000
             com.apple.nvidia.nv50hal(8.1.2)[988EAF3A-3318-3787-8A5A-844830FA1522]@0xffffff7 f93c82000->0xffffff7f93f56fff
                dependency: com.apple.NVDAResman(8.1.2)[96AE69DE-8A37-39D0-B2D3-D8446A6AA670]@0xffffff7f939 d1000
                dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f9392b000
    Your graphic card is damaged. This could be related to extensions, but the kernel panic gives you the message that your graphic card has failed.
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