IMac shuts down during start up

I installed Norton antivirus for mac, and to complete the installation I had to restart the mac.  So it restarts.  (Just to clarify if this does come up, I downloaded and made sure it was the official Norton page). 
But it makes the opening noise, shows the apple logo for like 10 seconds.  Then it shows a loading bar that fills up in about 10 seconds, then a second load bar pops up that appears for about 4 or 5 seconds, gets to about 10% full and the computer shuts itself down immediately. 
It happens exactly like that every single time. 
I had no issues with this computer whatsoever until this suddenly started happening.
I tried holding option button and it popped up a harddrive option.  Being unable to use my mouse on this screen, my only option seemed to be to hit enter and accept, so i did.  It went right back to the 2 loading bars underneath the apple logo before shutting itself down. 
I tried unplugging the power cord for 15 seconds (a second time did for 30 seconds) and then back in 5 seconds (second time waited 15 seconds after that) and then starting it up.  Nothing changed.
I tried holding down Command+option+P+R, the only thing that changed was the volume of the startup noise got louder (I understand the reset volume is natural with PRAM resetting).
Computer is about 2 and a half years old.  I don't have much on it backed up either.  Please don't criticize for this decision, I'm aware that I should have had everything backed up.  But if there is ANY way possible to redeem my computer and/or its contents; I am all ears.

My keyboard for whatever reason usually keeps de-activating (just replaced batteries) halfway in the middle of startup, so the Shift key to start up in safe mode doesn't register.

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    com.apple.filesystems.autofs          3.0
    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.iokit.IOBluetoothSerialManager          4.2.3f10
    com.apple.driver.AGPM          100.14.15
    com.apple.driver.AudioAUUC          1.60
    com.apple.driver.AppleMikeyHIDDriver          124
    com.apple.driver.AppleMikeyDriver          2.6.0f1
    com.apple.driver.AppleHDA          2.6.0f1
    com.apple.driver.AppleUpstreamUserClient          3.5.13
    com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
    com.apple.kext.AMDFramebuffer          1.2.0
    com.apple.driver.AppleBacklight          170.3.5
    com.apple.driver.AppleMCCSControl          1.1.12
    com.apple.driver.AppleLPC          1.7.0
    com.apple.AMDRadeonX3000          1.2.0
    com.apple.kext.AMD5000Controller          1.2.0
    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport          4.2.3f10
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AppleHWAccess          1
    com.apple.driver.Oxford_Semi          3.4.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          35
    com.apple.driver.AppleUSBCardReader          3.4.1
    com.apple.driver.AppleIRController          325.7
    com.apple.iokit.SCSITaskUserClient          3.6.6
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCIBlockStorage          2.5.1
    com.apple.driver.AppleUSBHub          666.4.0
    com.apple.driver.AppleFWOHCI          4.9.9
    com.apple.driver.AirPort.Atheros40          700.74.5
    com.apple.iokit.AppleBCM5701Ethernet          3.8.1b2
    com.apple.driver.AppleAHCIPort          3.0.0
    com.apple.driver.AppleUSBEHCI          660.4.0
    com.apple.driver.AppleRTC          2.0
    com.apple.driver.AppleACPIButtons          2.0
    com.apple.driver.AppleHPET          1.8
    com.apple.driver.AppleSMBIOS          2.1
    com.apple.driver.AppleACPIEC          2.0
    com.apple.driver.AppleAPIC          1.7
    com.apple.driver.AppleIntelCPUPowerManagementClient          216.0.0
    com.apple.nke.applicationfirewall          153
    com.apple.security.quarantine          3
    com.apple.driver.AppleIntelCPUPowerManagement          216.0.0
    com.apple.kext.triggers          1.0
    com.apple.iokit.IOSerialFamily          10.0.7
    com.apple.driver.DspFuncLib          2.6.0f1
    com.apple.vecLib.kext          1.0.0
    com.apple.driver.IOPlatformPluginLegacy          1.0.0
    com.apple.driver.AppleUSBAudio          2.9.5f4
    com.apple.iokit.IOAudioFamily          1.9.5fc2
    com.apple.kext.OSvKernDSPLib          1.14
    com.apple.driver.AppleSMBusPCI          1.0.12d1
    com.apple.iokit.IOFireWireIP          2.2.6
    com.apple.driver.AppleHDAController          2.6.0f1
    com.apple.iokit.IOHDAFamily          2.6.0f1
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.driver.AppleSMBusController          1.0.11d1
    com.apple.driver.IOPlatformPluginFamily          5.7.0d10
    com.apple.iokit.IONDRVSupport          2.4.1
    com.apple.iokit.IOAcceleratorFamily          98.14
    com.apple.kext.AMDSupport          1.2.0
    com.apple.AppleGraphicsDeviceControl          3.4.35
    com.apple.iokit.IOBluetoothHostControllerUSBTransport          4.2.3f10
    com.apple.iokit.IOSurface          91
    com.apple.iokit.IOGraphicsFamily          2.4.1
    com.apple.iokit.IOBluetoothFamily          4.2.3f10
    com.apple.driver.AppleSMC          3.1.8
    com.apple.driver.AppleUSBHIDKeyboard          170.15
    com.apple.driver.AppleHIDKeyboard          170.15
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    Memory Module: BANK 0/DIMM1, 4 GB, DDR3, 1333 MHz, 0x857F, 0x483634353155363446393333334700000000
    Memory Module: BANK 1/DIMM1, 4 GB, DDR3, 1333 MHz, 0x857F, 0x483634353155363446393333334700000000
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    Bluetooth: Version 4.2.3f10 13477, 3 services, 23 devices, 1 incoming serial ports
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    USB Device: USB 2.0 Hub [MTT]
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    USB Device: USB OPTICAL MOUSE
    USB Device: Internal Memory Card Reader
    USB Device: BRCM2046 Hub
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    FireWire Device: Elite Pro U3FW, OWC, Up to 800 Mb/sec
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