Kernel panics, spinning wheel and restart dialogs on startup

That's it! Time for a little help from you guys and gurus before I chuck my iMac out the window.
Configuration info:
iMac G5
PowerMac8,1
PowerPC G5 (3.0)
CPU's 1
1.8 GHz
L2-cache 512 K
Memory: 2 GB
600 MHz
Boot ROM-version: 5.2.2f4
System:
System: Mac OS X 10.4.5 (8H14)
Kernel-version: Darwin 8.5.0
Firewire:
LaCie 1394 DVD-R/RW+CD drive LUN 0
LaCie d2 Extreme LUN 0 HD 200GB
USB:
Canon i560 printer
Wacom Intuos 3
Background:
Coputer worked fine in Mac OSX 10.4.3
Problems:
After updating to 10.4.5... and reinstalling the system 5-6 times from scratch I have been getting kernel panics, spinning wheels and restart dialogs on startup intermittent.
The latest panic:
Panic (cpu 0 caller 0x002E0368) Unable to find driver for this platform PowerMac 8,1.
Kernel Version 8.5.0
There have been all sorts of kernel panics but I don't get a panic log since system seems to panic in such an early stage.
This has been done, more than once:
- Disconnected everything
- Reformatted HD and reinstalled from original CD
- Downloaded combo updates from Apple website and installed them after repairing disc and permissions first.
- Starts fine
- Repaired permissions again, after restart.
- installed one app at a time (latest updates on every app), allways restarting to see if everything still is fine, which it is.
- Reconnecting external drive, burner, printer etc. allways checking if everything is fine by doing a reboot. It is.
Computer seems happy, and so am I...
Next morning, a kernel panic, or a reboot dialog or spinning wheel at startup. I reboot, cross my fingers, and it starts up first, second or third try. No panic log other than the screen on startup.
- I reinstall combo update, restart and do a command-alt-P-R on the #&%?! and everything is fine... untill next day.
- I run Apple Diagnostic and there is a problem with one of the memory cards. I try it again and again looping. Now no problems found?! So I rum Memtest and still no problems found.
- I do this over and over againg to the point of physical illness.
- I reboot from my external drive with 10.4.3 without any problems whatsoever.
- Go back to 10.4.5 and the problems start again.
- I remove Apple caches, Extension caches, ATS and all that. Boots fine... untill next day?!
The most irritating thing is that once the computer boots up there are no apparent problems whatsoever using it.
I have read every post on kernel panics here, at apple website and at The X Lab. Tried - in my opinion - everything without getting to the bottom of it.
What did I forget?
What havent I tried?
I want my trusted Mac back!
Very thankful for any help whatsoever.
P.s. Since the computer works fine in 10.4.3 I don't see the point of taking it to service. It has to bee software related, no?
iMac G5 17/1.8/2GB/80/SD/56k   Mac OS X (10.4.5)   LaCie d2 Extreme 200GB Ext. HD. / Canon i560 print / LaCie 1394 DVD-R/RW+CD driv

Thank You for Your quick responce!
I have 2 1GB DIMMs installed from the shop when I bought my iMac. I read http://docs.info.apple.com/article.html?artnum=86814 about iMac Memory Specs and if I understand it correctly I could remove one of the DIMMs to test if the problem goes away. Although the computer will run better with two DIMMs it will work with one slot empty as well.
Did I understand that correctly?
iMac G5 17/1.8/2GB/80/SD/56k Mac OS X (10.4.5) LaCie d2 Extreme 200GB Ext. HD. / Canon i560 print / LaCie 1394 DVD-R/RW+CD driv

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                dependency: com.apple.iokit.IOUSBFamily(5.6.0)[065077C5-A49E-3C52-BDC0-60169E293563]@0xffff ff7faabf2000
             com.mice.driver.Xbox360Controller(1.0d12)[CD56688F-D773-3C80-AE8E-34AC8CAB8988] @0xffffff7fac96b000->0xffffff7fac970fff
                dependency: com.apple.iokit.IOHIDFamily(1.8.1)[F0B6DA72-B1C1-3816-AC9F-5F1C12E8A7DD]@0xffff ff7faaf6d000
                dependency: com.apple.iokit.IOUSBFamily(5.6.0)[065077C5-A49E-3C52-BDC0-60169E293563]@0xffff ff7faabf2000
    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:     0x000000002a400000
    Kernel text base: 0xffffff802a600000
    System model name: iMac12,1 (Mac-942B5BF58194151B)
    System uptime in nanoseconds: 52217882634442
    last loaded kext at 865739969775: com.devguru.driver.SamsungMTP    1.2.61 (addr 0xffffff7fac9bb000, size 393216)
    last unloaded kext at 938063291360: com.apple.driver.AppleUSBCDC    4.1.23 (addr 0xffffff7fac9b8000, size 12288)
    loaded kexts:
    com.paragon-software.filesystems.ntfs    82
    net.telestream.driver.TelestreamAudio    1.1.0
    com.Cycling74.driver.Soundflower    1.6.6
    com.mice.driver.Xbox360Controller    1.0.0d12
    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.AppleMikeyHIDDriver    122
    com.apple.driver.AppleHDA    2.3.7fc4
    com.apple.driver.AudioAUUC    1.60
    com.apple.driver.AppleUpstreamUserClient    3.5.10
    com.apple.kext.AMDFramebuffer    8.1.2
    com.apple.driver.AppleSMCLMU    2.0.3d0
    com.apple.driver.AppleMikeyDriver    2.3.7fc4
    com.apple.iokit.IOUserEthernet    1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X    7.0.0
    com.apple.driver.ApplePolicyControl    3.4.5
    com.apple.AMDRadeonAccelerator    1.0.8
    com.apple.filesystems.autofs    3.0
    com.apple.driver.AppleSMCPDRC    1.0.0
    com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport    4.1.4f2
    com.apple.driver.AppleIntelHD3000Graphics    8.1.2
    com.apple.driver.ACPI_SMC_PlatformPlugin    1.0.0
    com.apple.driver.AppleLPC    1.6.0
    com.apple.driver.AppleBacklight    170.2.5
    com.apple.driver.AppleMCCSControl    1.1.11
    com.apple.driver.AppleIntelSNBGraphicsFB    8.1.2
    com.apple.iokit.SCSITaskUserClient    3.5.5
    com.apple.driver.AppleUSBCardReader    3.1.7
    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.driver.XsanFilter    404
    com.apple.iokit.IOAHCIBlockStorage    2.3.1
    com.apple.driver.AppleUSBHub    5.5.5
    com.apple.driver.AppleFWOHCI    4.9.6
    com.apple.iokit.AppleBCM5701Ethernet    3.6.1b4
    com.apple.driver.AirPort.Atheros40    600.72.2
    com.apple.driver.AppleAHCIPort    2.5.2
    com.apple.driver.AppleUSBEHCI    5.5.0
    com.apple.driver.AppleEFINVRAM    1.7
    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.driver.AppleBluetoothHIDKeyboard    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.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.AppleSMBusPCI    1.0.11d0
    com.apple.iokit.IOAcceleratorFamily    74.5.1
    com.apple.kext.AMD6000Controller    8.1.2
    com.apple.kext.AMDSupport    8.1.2
    com.apple.kext.triggers    1.0
    com.apple.iokit.AppleBluetoothHCIControllerUSBTransport    4.1.4f2
    com.apple.iokit.IOFireWireIP    2.2.5
    com.apple.driver.AppleHDAController    2.3.7fc4
    com.apple.iokit.IOHDAFamily    2.3.7fc4
    com.apple.driver.AppleThunderboltEDMSink    1.1.8
    com.apple.driver.AppleThunderboltEDMSource    1.1.8
    com.apple.driver.AppleGraphicsControl    3.4.5
    com.apple.driver.AppleSMC    3.1.4d2
    com.apple.driver.IOPlatformPluginLegacy    1.0.0
    com.apple.driver.IOPlatformPluginFamily    5.3.0d51
    com.apple.driver.AppleBacklightExpert    1.0.4
    com.apple.iokit.IONDRVSupport    2.3.7
    com.apple.driver.AppleSMBusController    1.0.11d0
    com.apple.iokit.IOGraphicsFamily    2.3.7
    com.apple.iokit.IOSCSIMultimediaCommandsDevice    3.5.5
    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.driver.AppleThunderboltDPOutAdapter    1.8.9
    com.apple.driver.AppleThunderboltDPInAdapter    1.8.9
    com.apple.driver.AppleThunderboltDPAdapterFamily    1.8.9
    com.apple.driver.AppleThunderboltPCIDownAdapter    1.2.6
    com.apple.iokit.IOSCSIBlockCommandsDevice    3.5.5
    com.apple.iokit.IOUSBMassStorageClass    3.5.1
    com.apple.iokit.IOSCSIArchitectureModelFamily    3.5.5
    com.apple.iokit.IOUSBHIDDriver    5.2.5
    com.apple.driver.AppleUSBMergeNub    5.5.5
    com.apple.driver.AppleUSBComposite    5.2.5
    com.apple.driver.AppleThunderboltNHI    1.7.8
    com.apple.iokit.IOThunderboltFamily    2.4.0
    com.apple.iokit.IOUSBUserClient    5.5.5
    com.apple.iokit.IOFireWireFamily    4.5.5
    com.apple.iokit.IOEthernetAVBController    1.0.2b1
    com.apple.iokit.IO80211Family    530.4
    com.apple.iokit.IONetworkingFamily    3.0
    com.apple.iokit.IOAHCIFamily    2.3.1
    com.apple.iokit.IOUSBFamily    5.6.0
    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
    Model: iMac12,1, BootROM IM121.0047.B1F, 4 processors, Intel Core i5, 2.5 GHz, 4 GB, SMC 1.71f22
    Graphics: AMD Radeon HD 6750M, AMD Radeon HD 6750M, PCIe, 512 MB
    Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3230554638424353302D444A2D4620
    Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3230554638424353302D444A2D4620
    AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x9A), Atheros 9380: 4.0.72.0-P2P
    Bluetooth: Version 4.1.4f2 12041, 2 service, 18 devices, 1 incoming serial ports
    Network Service: Wi-Fi, AirPort, en1
    Serial ATA Device: WDC WD5000AAKS-402AA0, 500,11 GB
    Serial ATA Device: HL-DT-STDVDRW  GA32N
    USB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x850b, 0xfa200000 / 3
    USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfa100000 / 2
    USB Device: USB Keyboard, 0x04f2  (Chicony Electronics Co., Ltd.), 0x0833, 0xfa120000 / 5
    USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000 / 4
    USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0xfa111000 / 6
    USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfd100000 / 2
    USB Device: Controller, 0x045e  (Microsoft Corporation), 0x028e, 0xfd130000 / 6
    USB Device: Razer Abyssus 1800, 0x1532, 0x0020, 0xfd140000 / 5
    USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 4
    USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfd110000 / 3

    Most likely, one of these is the culprit.
    ccom.paragon-software.filesystems.ntfs    82
    net.telestream.driver.TelestreamAudio    1.1.0
    com.Cycling74.driver.Soundflower    1.6.6
    com.mice.driver.Xbox360Controller    1.0.0d12
    Boot into safe mode (restart holding down SHIFT key). If no KP, then disable these, reenable one at time to determine which. If KP, then most likely hardware related. Run the Apple Hardware Test suite, extended tests at least twice, followed by  Rember.  See
    About kernel panics,
    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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