1.8Ghz iMac G5 - Will not boot from HD or other startup volume

Okay, thought I would post here regardless that this seems to be a "take it in for service" issue...
The iMac was running painfully slow last night, so I walked away and did not manually sleep it. This morning, it seemed to be asleep except that the light was not pulsing, but was full-on bright. Attempts to wake it were fruitless, so I attempted to force it down via the power switch and restart. Upon rebooting (which took a few minutes longer than usual), it got to the apple and pinwheel/gear screen, then went black except for the arrow cursor in the upper left corner, which changed after a time to the "beachball" (not spinning).
I then tried resetting the PRAM and SMU, no change.
I tried rebooting in safe mode and got to the login screen, but the keyboard and mouse are not being recognized.
I then tried rebooting in single-user mode to run fsck, but once at the prompt, the keyboard is again not being recognized.
Attempts to startup from a system disk yielded the same thing—black screen, arrow cursor at upper left, etc.
All devices except the keyboard and mouse have been unplugged throughout all attempts to restart.
Since I am in the market (possibly now by necessity) for a new iMac, my attention turned to getting my files off the drive... Luckily, it was recognized by my old Powerbook in target mode (yay).
Any ideas, suggestions?

Update: Just ran the Hardware Test again, this time the Extended Test, and it reported "2GMC/3/16: built-in." Logic board failure, anyone?
It seems like I've had more than my fair share of logic board issues with this machine... It was replaced while under the original warranty and again last December on Apple's dime when I raised a bit of **** about it, and now it seems to have failed again. The last replacement only had a 90-day warranty, so I guess I'm hosed this time.

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    RAX: 0x0000000000000001, RBX: 0xffffff8050e00000, RCX: 0xffffff801aa8eb00, RDX: 0xffffff80602dba38
    RSP: 0xffffff80602dbb60, RBP: 0xffffff80602dbb60, RSI: 0x0000000000000000, RDI: 0x0000000000000000
    R8:  0x0000000000000000, R9:  0x00000000000000ff, R10: 0xffffffffffffffff, R11: 0x00000000ffffffff
    R12: 0xffffff8050e00000, R13: 0x0000000000000000, R14: 0x0000000000000002, R15: 0x0000000000000000
    RFL: 0x0000000000010246, RIP: 0xffffff7f9bab8654, CS:  0x0000000000000008, SS:  0x0000000000000010
    Fault CR2: 0x0000000000000010, Error code: 0x0000000000000000, Fault CPU: 0x0

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    CR0: 0x000000008001003b, CR2: 0x0000000000000010, CR3: 0x0000000011803000, CR4: 0x0000000000000660
    RAX: 0x0000000000000001, RBX: 0xffffff8050e00000, RCX: 0xffffff801aa8eb00, RDX: 0xffffff80602dba38
    RSP: 0xffffff80602dbb60, RBP: 0xffffff80602dbb60, RSI: 0x0000000000000000, RDI: 0x0000000000000000
    R8:  0x0000000000000000, R9:  0x00000000000000ff, R10: 0xffffffffffffffff, R11: 0x00000000ffffffff
    R12: 0xffffff8050e00000, R13: 0x0000000000000000, R14: 0x0000000000000002, R15: 0x0000000000000000
    RFL: 0x0000000000010246, RIP: 0xffffff7f9bab8654, CS:  0x0000000000000008, SS:  0x0000000000000010
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    0xffffff80602dbbb0 : 0xffffff7f9baa20e2
    0xffffff80602dbbd0 : 0xffffff7f9ba73554
    0xffffff80602dbc00 : 0xffffff7f9aa8d470
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    0xffffff80602dbc60 : 0xffffff7f9aa926ec
    0xffffff80602dbcf0 : 0xffffff7f9aa8af20
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    0xffffff80602dbd70 : 0xffffff801a833b9b
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    0xffffff80602dbe30 : 0xffffff801a497cef
    0xffffff80602dbe80 : 0xffffff801a420abd
    0xffffff80602dbeb0 : 0xffffff801a410448
    0xffffff80602dbf00 : 0xffffff801a4195fb
    0xffffff80602dbf70 : 0xffffff801a4a5ad6
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             com.apple.iokit.IOGraphicsFamily(2.3.4)[2600903C-EEDE-321B-A023-169DC9B26EA6]@0 xffffff7f9aa81000->0xffffff7f9aab8fff
                dependency: com.apple.iokit.IOPCIFamily(2.7)[8C9E06A4-13D0-33F5-A377-9E36F0ECC229]@0xffffff 7f9aa4d000
             com.apple.NVDAResman(8.0)[6A699209-FB98-316B-A3C0-DCA82AA8C86B]@0xffffff7f9aad8 000->0xffffff7f9addafff
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                dependency: com.apple.iokit.IONDRVSupport(2.3.4)[99CA4184-8D92-31B2-8726-46139E8E3DFF]@0xff ffff7f9aac4000
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    Darwin Kernel Version 12.1.0: Tue Aug 14 13:29:55 PDT 2012; root:xnu-2050.9.2~1/RELEASE_X86_64
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    com.apple.driver.AppleHDAHardwareConfigDriver          2.3.0f2
    com.apple.driver.AppleHDA          2.3.0f2
    com.apple.driver.AppleTyMCEDriver          1.0.2d2
    com.apple.filesystems.autofs          3.0
    com.apple.iokit.IOBluetoothSerialManager          4.0.9f8
    com.apple.iokit.IOBluetoothUSBDFU          4.0.9f8
    com.apple.driver.AppleLPC          1.6.0
    com.apple.driver.AppleMuxControl          3.2.6
    com.apple.driver.AppleBacklight          170.2.3
    com.apple.driver.AppleUpstreamUserClient          3.5.10
    com.apple.driver.AppleMCCSControl          1.0.33
    com.apple.GeForce          8.0.0
    com.apple.driver.AppleSMCPDRC          1.0.0
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.ApplePolicyControl          3.2.6
    com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
    com.apple.driver.AppleIRController          320.15
    com.apple.iokit.SCSITaskUserClient          3.5.1
    com.apple.driver.AppleFileSystemDriver          3.0.1
    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          2.2.1
    com.apple.driver.AppleFWOHCI          4.9.5
    com.apple.driver.AppleUSBHub          5.1.6
    com.apple.driver.AirPortBrcm43224          600.36.17
    com.apple.iokit.AppleYukon2          3.2.3b1
    com.apple.driver.AppleAHCIPort          2.4.0
    com.apple.driver.AppleIntelPIIXATA          2.5.1
    com.apple.driver.AppleUSBEHCI          5.1.5
    com.apple.driver.AppleUSBUHCI          5.1.5
    com.apple.driver.AppleEFINVRAM          1.6.1
    com.apple.driver.AppleRTC          1.5
    com.apple.driver.AppleHPET          1.7
    com.apple.driver.AppleACPIButtons          1.6
    com.apple.driver.AppleSMBIOS          1.9
    com.apple.driver.AppleACPIEC          1.6
    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
    com.apple.driver.AppleIntelCPUPowerManagement          196.0.0
    com.apple.driver.DspFuncLib          2.3.0f2
    com.apple.iokit.IOAudioFamily          1.8.9fc9
    com.apple.kext.OSvKernDSPLib          1.6
    com.apple.kext.triggers          1.0
    com.apple.iokit.IOSerialFamily          10.0.6
    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.driver.AppleSMBusController          1.0.10d0
    com.apple.nvidia.nv50hal          8.0.0
    com.apple.NVDAResman          8.0.0
    com.apple.iokit.IOFireWireIP          2.2.5
    com.apple.driver.AppleHDAController          2.3.0f2
    com.apple.iokit.IOHDAFamily          2.3.0f2
    com.apple.iokit.IOSurface          86.0.2
    com.apple.iokit.IOBluetoothFamily          4.0.9f8
    com.apple.driver.AppleGraphicsControl          3.2.6
    com.apple.iokit.IONDRVSupport          2.3.4
    com.apple.iokit.IOGraphicsFamily          2.3.4
    com.apple.driver.AppleSMC          3.1.3d11
    com.apple.driver.IOPlatformPluginLegacy          1.0.0
    com.apple.driver.IOPlatformPluginFamily          5.2.0d16
    com.apple.iokit.IOUSBHIDDriver          5.0.0
    com.apple.driver.AppleUSBMergeNub          5.1.5
    com.apple.driver.AppleUSBComposite          5.0.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.5.1
    com.apple.iokit.IOBDStorageFamily          1.7
    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily          1.7.1
    com.apple.iokit.IOATAPIProtocolTransport          3.5.0
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.1
    com.apple.iokit.IOFireWireFamily          4.5.5
    com.apple.iokit.IOUSBUserClient          5.0.0
    com.apple.iokit.IO80211Family          500.15
    com.apple.iokit.IONetworkingFamily          3.0
    com.apple.iokit.IOAHCIFamily          2.2.0
    com.apple.iokit.IOATAFamily          2.5.1
    com.apple.iokit.IOUSBFamily          5.1.6
    com.apple.driver.AppleEFIRuntime          1.6.1
    com.apple.iokit.IOHIDFamily          1.8.0
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          220
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.DiskImages          344
    com.apple.iokit.IOStorageFamily          1.8
    com.apple.driver.AppleKeyStore          28.18
    com.apple.driver.AppleACPIPlatform          1.6
    com.apple.iokit.IOPCIFamily          2.7
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.corecrypto          1.0
    Model: iMac8,1, BootROM IM81.00C1.B00, 2 processors, Intel Core 2 Duo, 3.06 GHz, 2 GB, SMC 1.30f1
    Graphics: NVIDIA GeForce 8800 GS, NVIDIA GeForce 8800 GS, PCIe, 512 MB
    Memory Module: BANK 0/DIMM0, 1 GB, DDR2 SDRAM, 800 MHz, 0x2C00000000000000, 0x38485446313238363448445A2D3830304531
    Memory Module: BANK 1/DIMM1, 1 GB, DDR2 SDRAM, 800 MHz, 0x2C00000000000000, 0x38485446313238363448445A2D3830304531
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8C), Broadcom BCM43xx 1.0 (5.10.131.36.16)
    Bluetooth: Version 4.0.9f8 10405, 2 service, 18 devices, 1 incoming serial ports
    Serial ATA Device: WDC WD5000AAKS-40YGA1, 500.11 GB
    Parallel ATA Device: MATSHITADVD-R   UJ-875
    USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0xfd400000 / 2
    USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x1a100000 / 2
    USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x820f, 0x1a110000 / 5
    USB Device: IR Receiver, apple_vendor_id, 0x8242, 0x5d100000 / 2
    USB Device: Hub in Apple Extended USB Keyboard, apple_vendor_id, 0x1002, 0x1d100000 / 2
    USB Device: Trackball, 0x046d  (Logitech Inc.), 0xc404, 0x1d120000 / 4
    USB Device: Apple Extended USB Keyboard, apple_vendor_id, 0x0204, 0x1d110000 / 3

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    UPDATE: An interesting development!
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  • Will Not Boot from Install Disc  & 4SNS/1/40000000: TG0D - Thermal Sensor?

    *Will Not Boot from Install Disc*
    I used the "option key" approach with the gray start up disk. At first it ejected the start up disk. Then I nudged the disk back in the machine and it showed on the screen as an option. I clicked on the start up disk image and it finally loaded.
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    The answer was in your post: "You will need to take it to Apple for repair."

  • G4 that will not boot from any disc EXCEPT the Apple Hardware Test CD

    We have a DP 1ghz Quicksilver PowerMac G4 that will not boot from any disc EXCEPT the Apple Hardware Test CD that came with the machine.
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    The Mac was originally OSX Server 10.1 that we later converted to a worksation running 10.3 Panther.
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    - Zap PRAM
    - Reset CUDA switch
    - Unplug the MAC and remove everything (RAM, Battery, etc) for 30 minutes and try to reboot
    - Tried booting from the Macintosh Server G4 Software Restore CD
    - Tried booting from Mac OS X Server CD
    - Tried booting from AppleCare Protection Plan CD with TechTool
    - Tried booting from Diskwarrior CD
    - Tried booting from an external FireWire drive with a disk image of Tiger OS Install
    - Tried booting with the hard drive disconnected
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    Conventional wisdom says that any Mac that will not boot up from a System/Install CD OS 9 or an Install CD Mac OS X, has a Hardware problem.
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  • RE: HP XP Media Center 2005 Ed will not boot from HP System Restore CD's

    RE: HP XP Media Center 2005 Ed will not boot from HP System Restore CD's.
    The following instructions about  the "Code Purple" error FAILED. Error is still present.
    ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    ***PLAIN ENGLISH QUICK AND EASY FIX FOR ALL SYSTEMS****
    ***Windows 7 code purple or Windows Vista code purple***
    With the code purple error on the screen, press shift+f10 (the shift key and the F10  key (at the top of the keyboard) at the same time) to open a little screen called a  command prompt. (So, you get a little black screen with white text that says something  about your Windows verison first and a little ways down you'll see "C:\>".   It's all  ready for you to start typing.)
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    ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    1. The PC will not boot the System Restore CD's
    2. The Original OS install and [HP_RECOVERY] disk sector has been severely damaged by
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        B. The user had originally updated the pc to Vista Business Express Upgrade
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    SO IF YOU THINK YOU ARE UP TO THIS CHALLANGE, SEND MESSAGES TO DAVHPForum anytime. Thanks in advance!
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    Hello @DAVHPForum,
    Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
    I have read your post on how you are not able to boot your computer using the HP system restore CDs, and I would be happy to assist you in this matter!
    If you are not able to recover your system by following the steps in this document, please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region.
    http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
    I hope this helps!
    Regards
    MechPilot
    I work on behalf of HP
    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
    Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

  • PowerPC G5 will not boot (from CD, single-user, verbose...) - is it dead?

    I had posted this in the OSX forum but had a suggestion to post here as well - any suggestions would be greatly appreciated!
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    Hi svman8-
    Did you also reset the SMU?
    One thing known to cure various ills is to replace the battery.
    This may be a helpful link:
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    Luck-
    -DP

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    Regards
    Solid Cruver
    Did someone help you today? Press the star on the left to thank them with a Kudo!
    If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.
    Follow @LenovoForums on Twitter!

  • Wiped macbook pro will not boot from install DVD

    I recently purchased an older MacBook Pro that came with the OS system wiped but it did have the original Install DVDs.  The computer will not boot from the DVD.  I have booted holding down the C key and nothing happens.  I have booted holding down the Option key and it shows the Install DVD and I select this and nothing happens.
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    It could be a problem with the optical drive, but also may be due to the DVD's being for a different model.
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  • Optical drive trashed and MB Pro will not boot from USB image

    Hello,
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    It isn't clear what you mean about your HD being trashed or which disk (HD or USB drive) you are trying to repair, but either way you need to start up from your Snow Leopard installer DVD & instead of installing anything go to the Utilities menu & run Disk Utility from there to repair either or both of the disks.

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