What caused "You need to restart your computer.  Hold down the Power button for several seconds or push the restart button."

This was displayed in four lanuages.  When I restarted I was asked to submit an error report.  The gave programmer details and indicated my OS 10.4 had quit.  I was reading a news article on DailyMail.co.uk at the time.
I ran a Sophos antivirus scan on the whole disk and no threats were identified. 
This has apparently happened a couple times previously.  I thought the computer had not booted up properly since it had a black box where this message appeared and the machine was unresponsive.
Any suggestsions for cause and/or solution.

Apple won't work on it anymore. And, take it from me (hard experience: three boards changed and the G5 finally croaked from the graphics chip problem) you don't want to bring it to an AASP either, because if they are able to get a new logic board from Apple, it will croak in short time also. These were not refurbed properly. And, by now, the caps on a refurbed board will be ancient, anyway. In addition, there is a serious potential issue with the graphics chip. There was a repair extension in effect for both issues, the caps and the chip, but it's long since gone.
There might also be bad caps in the power supply.
Those three bad caps, and possibly others, are enough to bring this machine down.
There are some delicate soldering skills involved in replacing the caps. Most people with experience recommend practising first on a disposable board.
You can get a set of the caps which will fit properly from
http://jimwarholic.com/2008/07/how-to-repair-apple-imac-g5.php
There's also badcaps, who I think will work on these.
http://www.badcaps.net/
Also have a look at the posts inside these threads from resident expert spudnuty.
https://discussions.apple.com/thread/2287036?threadID=2287036&tstart=0
https://discussions.apple.com/message/11896037?messageID=11896037#11896037
And there are one or two others who will do the repairs. I can't remember right now, but I'll look into it and post here again, probably tomorrow.
Basically, I don't think you want to put any big money into this.
EDIT: just remembered another. There was another one located in Oregon and I think he's now out of business.
http://www.dttservice.com/imacg5.html
Get the caps and maybe have some local guy work on it.
Message was edited by: WZZZ

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    org.virtualbox.kext.VBoxNetFlt          4.2.16
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    org.virtualbox.kext.VBoxDrv          4.2.16
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    com.apple.filesystems.smbfs          1.7.2
    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.driver.AppleMikeyHIDDriver          122
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    com.apple.driver.AudioAUUC          1.59
    com.apple.driver.AppleHDA          2.2.5a5
    com.apple.driver.AppleMikeyDriver          2.2.5a5
    com.apple.driver.AGPM          100.12.75
    com.apple.driver.AppleUpstreamUserClient          3.5.9
    com.apple.driver.SMCMotionSensor          3.0.2d6
    com.apple.driver.AppleSMCPDRC          5.0.0d8
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AudioIPCDriver          1.2.3
    com.apple.driver.AppleSMCLMU          2.0.1d2
    com.apple.driver.ApplePolicyControl          3.1.33
    com.apple.driver.ACPI_SMC_PlatformPlugin          5.0.0d8
    com.apple.driver.AppleIntelHD3000Graphics          7.3.2
    com.apple.driver.AppleBacklight          170.2.2
    com.apple.driver.AppleLPC          1.6.0
    com.apple.driver.AppleMCCSControl          1.0.33
    com.apple.filesystems.autofs          3.0
    com.apple.driver.AppleUSBTCButtons          227.6
    com.apple.driver.BroadcomUSBBluetoothHCIController          4.0.8f17
    com.apple.driver.AppleUSBTCKeyboard          227.6
    com.apple.driver.AppleIRController          312
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          33
    com.apple.iokit.SCSITaskUserClient          3.2.1
    com.apple.driver.XsanFilter          404
    com.apple.iokit.IOAHCISerialATAPI          2.0.3
    com.apple.iokit.IOAHCIBlockStorage          2.1.0
    com.apple.driver.AppleUSBHub          5.1.0
    com.apple.driver.AppleFWOHCI          4.9.0
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    com.apple.iokit.AppleBCM5701Ethernet          3.2.4b8
    com.apple.driver.AppleEFINVRAM          1.6.1
    com.apple.driver.AppleSmartBatteryManager          161.0.0
    com.apple.driver.AppleAHCIPort          2.3.1
    com.apple.driver.AppleUSBEHCI          5.1.0
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    com.apple.driver.AppleRTC          1.5
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    com.apple.driver.AppleSMBIOS          1.9
    com.apple.driver.AppleACPIEC          1.5
    com.apple.driver.AppleAPIC          1.6
    com.apple.driver.AppleIntelCPUPowerManagementClient          195.0.0
    com.apple.nke.applicationfirewall          3.2.30
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    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.driver.AppleBacklightExpert          1.0.4
    com.apple.driver.IOPlatformPluginFamily          5.1.1d6
    com.apple.iokit.IONDRVSupport          2.3.4
    com.apple.driver.AppleSMBusController          1.0.10d0
    com.apple.driver.AppleIntelSNBGraphicsFB          7.3.2
    com.apple.iokit.IOGraphicsFamily          2.3.4
    com.apple.kext.triggers          1.0
    com.apple.driver.AppleUSBBluetoothHCIController          4.0.8f17
    com.apple.iokit.IOBluetoothFamily          4.0.8f17
    com.apple.driver.AppleThunderboltDPInAdapter          1.8.5
    com.apple.driver.AppleThunderboltDPAdapterFamily          1.8.5
    com.apple.driver.AppleThunderboltPCIDownAdapter          1.2.5
    com.apple.driver.AppleUSBMultitouch          230.5
    com.apple.iokit.IOUSBHIDDriver          5.0.0
    com.apple.driver.AppleUSBMergeNub          5.1.0
    com.apple.driver.AppleUSBComposite          5.0.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.2.1
    com.apple.iokit.IOBDStorageFamily          1.7
    com.apple.iokit.IODVDStorageFamily          1.7.1
    com.apple.iokit.IOCDStorageFamily          1.7.1
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.2.1
    com.apple.driver.AppleThunderboltNHI          1.6.0
    com.apple.iokit.IOThunderboltFamily          2.0.3
    com.apple.iokit.IOUSBUserClient          5.0.0
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    com.apple.iokit.IO80211Family          420.3
    com.apple.iokit.IOEthernetAVBController          1.0.1b1
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    com.apple.iokit.IOAHCIFamily          2.0.8
    com.apple.iokit.IOUSBFamily          5.1.0
    com.apple.driver.AppleEFIRuntime          1.6.1
    com.apple.iokit.IOHIDFamily          1.7.1
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          177.11
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.driver.DiskImages          331.7
    com.apple.iokit.IOStorageFamily          1.7.2
    com.apple.driver.AppleKeyStore          28.18
    com.apple.driver.AppleACPIPlatform          1.5
    com.apple.iokit.IOPCIFamily          2.7
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    I reseated the memory and made sure they were in there properly, and I also installed the HDD and ran DiskUtility before I erased/reformatted and installed a fresh version of MacOSX Leopard, then updated to Snow Leopard.
    As long as I am using my computer everything works fine, the problem occurs when the machine is shut off or put to sleep for a long period of time. Because when I shut it off and turn it right back on a few minutes later it works, or if I shut the lid and open it 10-20 min. later everything works fine, it's only when the machine is off or asleep for long periods of time.
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  • Help with Kernal Panic; "You need to restart your computer..." on startup

    My sister just gave me her old iBook G4. I don't know what OS it is running and I don't know the exact model beyond iBook G4. She is currently looking for the disks that came with it.
    Everytime I try to start the computer, before I get past the screen with the apple, the screen goes grey and I get the following message:
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    Thanks,
    Brett

    Hi Brett and welcome to Apple Discussions.
    You could try Starting up in Safe Mode
    What is Safe Boot, Safe Mode
    Safe Boot takes longer than normal startup
    Safe boot may by-pass the problematic process/hardware (the airport card is a frequent culprit) and enable you to boot sufficiently to find out the OS. Click on the blue Apple top/left, then 'About this Mac'. If Safe Boot is successful take a look at Macintosh HD/Library/Logs, particularly Console and Panic. I'm no expert on deciphering logs but you could copy/past the last couple of paragraphs of Panic into a reply.
    Good luck,
    Adrian

  • On startup: "You need to restart your computer. Hold down ..."

    When I start up from system folder 10.4.3 on hard disk, I get this message:
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    When I do this, my eMac restarts but returns to this very same message.
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    Find some body that can download and and burn you a copy of techtool 3.0.4 contact micromat and see if they know of a way to roll back a repair. Diskwarrior might help. There again check for the version number compatibility. Utilities are not like they use to be on OS9 and below; here you could use a version designed for lower OS and get by using it.
    Todays utilities are based on the operating system themselves. There was a Major change in the version of UNIX used in OS X.3 and X.4 previously they used BSD (Berkley Systems Development) originated my Berkley University. Apple had to pay a Royalty payment for each copy sold. OSX uses FreeBSD UNIX which originally started from BSD UNIX; but, was taken over by the General UNIX community under a License like Mozilla uses for FIreFox and others. Anyway it can be used Royalty free. What's better is FreeBSD is constantly being improved literally daiyly; and therefore is much improved.
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