IMac keeps feezing and showing a coloured screen

Hi All
My iMac keeps freezing and I've tried a few standard trouble shooting methods but can't figuire out what's wrong with it.
It keeps freezing and stops responding and then shows a coloured screen. Once it was a bright green screen, another time it was dark black and another time it was light yellow. The first time it happened odd random pixels could be seen on screen that weren't meant to be there. Holding down the power button and restarting is the only way to sort it out.
It normally happens 10 - 15 mins after boot up, generally doing fairly mundane tasks (spotify, safari, mail).
I've tried doing a software update and also veryfying and repaing the disk and I was wondering if there was anything else I could try.
It's an early 2008 24" iMac running Lion 10.7.2.
Any help or suggestions would be appreciated, I'm hoping it's not a hardware problems
Thanks.

I've have now:
- Verified Disk Permissions
- Repaired Disk Permissions
- Reset PRAM
- Reset SMC
- Performed an extended Apple Hardware test which came back with no problems
The issue still persists unless I am in safe mode.
I don't suppose there is anything else I could try before I take it to a shop?

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    com.apple.driver.AppleHWAccess          1
    com.apple.iokit.IOBluetoothUSBDFU          4.2.0f6
    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport          4.2.0f6
    com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
    com.apple.driver.AppleMikeyDriver          2.5.2fc2
    com.apple.driver.AppleLPC          1.7.0
    com.apple.driver.AppleMuxControl          3.4.12
    com.apple.driver.AppleBacklight          170.3.5
    com.apple.GeForceTesla          8.1.8
    com.apple.driver.AppleUpstreamUserClient          3.5.13
    com.apple.driver.AppleMCCSControl          1.1.12
    com.apple.nvidia.NVDAStartup          8.1.8
    com.apple.driver.iPodSBCDriver          1.7.0
    com.apple.driver.AppleIRController          325.7
    com.apple.driver.AppleFileSystemDriver          3.0.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          35
    com.apple.iokit.SCSITaskUserClient          3.6.0
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCIBlockStorage          2.4.0
    com.apple.nvenet          2.0.21
    com.apple.driver.AppleFWOHCI          4.9.9
    com.apple.driver.AirPort.Brcm4331          700.20.22
    com.apple.driver.AppleUSBHub          650.4.4
    com.apple.driver.AppleUSBEHCI          650.4.1
    com.apple.driver.AppleAHCIPort          2.9.5
    com.apple.driver.AppleUSBOHCI          650.4.1
    com.apple.driver.AppleRTC          2.0
    com.apple.driver.AppleHPET          1.8
    com.apple.driver.AppleACPIButtons          2.0
    com.apple.driver.AppleSMBIOS          2.0
    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.driver.IOBluetoothHIDDriver          4.2.0f6
    com.apple.driver.AppleMultitouchDriver          245.13
    com.apple.AppleGraphicsDeviceControl          3.4.12
    com.apple.kext.triggers          1.0
    com.apple.iokit.IOSerialFamily          10.0.7
    com.apple.driver.DspFuncLib          2.5.2fc2
    com.apple.vecLib.kext          1.0.0
    com.apple.iokit.IOAudioFamily          1.9.4fc11
    com.apple.kext.OSvKernDSPLib          1.14
    com.apple.iokit.IOSurface          91
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    com.apple.driver.AppleHDAController          2.5.2fc2
    com.apple.iokit.IOHDAFamily          2.5.2fc2
    com.apple.driver.AppleSMC          3.1.6d1
    com.apple.driver.IOPlatformPluginLegacy          1.0.0
    com.apple.driver.AppleSMBusPCI          1.0.12d1
    com.apple.driver.IOPlatformPluginFamily          5.5.1d27
    com.apple.driver.AppleGraphicsControl          3.4.12
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.nvidia.classic.NVDANV50HalTesla          8.1.8
    com.apple.driver.AppleSMBusController          1.0.11d1
    com.apple.nvidia.classic.NVDAResmanTesla          8.1.8
    com.apple.iokit.IONDRVSupport          2.3.6
    com.apple.iokit.IOGraphicsFamily          2.3.6
    com.apple.iokit.IOUSBMassStorageClass          3.6.0
    com.apple.driver.AppleUSBHIDKeyboard          170.15
    com.apple.driver.AppleHIDKeyboard          170.15
    com.apple.iokit.IOUSBHIDDriver          650.4.4
    com.apple.driver.AppleUSBMergeNub          650.4.0
    com.apple.driver.AppleUSBComposite          650.4.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.6.0
    com.apple.iokit.IOBDStorageFamily          1.7
    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily          1.7.1
    com.apple.iokit.IOAHCISerialATAPI          2.6.0
    com.apple.iokit.IOFireWireSBP2          4.2.5
    com.apple.iokit.IOSCSIBlockCommandsDevice          3.6.0
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.6.0
    com.apple.iokit.IOFireWireFamily          4.5.5
    com.apple.iokit.IO80211Family          600.34
    com.apple.iokit.IONetworkingFamily          3.2
    com.apple.iokit.IOUSBUserClient          650.4.4
    com.apple.driver.AppleEFINVRAM          2.0
    com.apple.driver.NVSMU          2.2.9
    com.apple.driver.AppleEFIRuntime          2.0
    com.apple.iokit.IOAHCIFamily          2.6.0
    com.apple.iokit.IOUSBFamily          650.4.4
    com.apple.iokit.IOHIDFamily          2.0.0
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          278.10
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.AppleKeyStore          2
    com.apple.driver.DiskImages          371.1
    com.apple.iokit.IOStorageFamily          1.9
    com.apple.iokit.IOReportFamily          21
    com.apple.driver.AppleFDEKeyStore          28.30
    com.apple.driver.AppleACPIPlatform          2.0
    com.apple.iokit.IOPCIFamily          2.8
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.pthread          1
    com.apple.kec.corecrypto          1.0
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    USB Device: Apple Keyboard
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    USB Device: BRCM2046 Hub
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    SarahO_VZW
    Follow us on Twitter @VZWSupport

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