G5 Mac Just Turns Off!

Hello, I have a G5mac, it is approx 15 months old.
Up to now nothing has gone wrong but about 2 weeks ago it just turned off as if the plug had been pulled out. This happens about 5 times per day and can be higher for no apparent reason, it can happen whether i am on the net, itunes or microsoft office, or anything else.
When I turn it back on it has come up with a text box saying that the itunes library is damaged and that the mac will try and recover the library. This has happened twice only and has resulted in hundreds of tracks being lost.
Is there anyone that can help?
Richard.

Hope this is not an epidemic...
http://discussions.apple.com/thread.jspa?threadID=364712&tstart=15
Post again if none of it helps. Good Luck.

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    com.apple.filesystems.autofs          2.1.0
    com.apple.driver.AppleMikeyHIDDriver          1.2.0
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    com.apple.driver.AppleIntelHDGraphicsFB          6.4.0
    com.apple.driver.AppleUSBTCButtons          201.6
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    com.apple.driver.AppleUSBTCKeyboard          201.6
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    com.apple.driver.AppleSMBIOS          1.7
    com.apple.driver.AppleACPIEC          1.3.6
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    com.apple.driver.AppleIntelCPUPowerManagementClient          142.6.0
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    com.apple.security.quarantine          0
    com.apple.nke.applicationfirewall          2.1.14
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    com.apple.driver.AppleProfileReadCounterAction          17
    com.apple.driver.DspFuncLib          2.0.5f14
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    com.apple.driver.AppleProfileThreadInfoAction          14
    com.apple.driver.AppleProfileRegisterStateAction          10
    com.apple.driver.AppleProfileKEventAction          10
    com.apple.driver.AppleProfileCallstackAction          20
    com.apple.driver.AppleSMBusController          1.0.10d0
    com.apple.iokit.IOSurface          74.2
    com.apple.iokit.IOBluetoothSerialManager          2.4.5f3
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    com.apple.iokit.IOFireWireIP          2.0.3
    com.apple.iokit.IOAudioFamily          1.8.3fc2
    com.apple.kext.OSvKernDSPLib          1.3
    com.apple.driver.AppleHDAController          2.0.5f14
    com.apple.iokit.IOHDAFamily          2.0.5f14
    com.apple.iokit.AppleProfileFamily          41
    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.driver.AppleBacklightExpert          1.0.1
    com.apple.nvidia.nv50hal          6.4.0
    com.apple.NVDAResman          6.4.0
    com.apple.driver.AppleSMC          3.1.0d5
    com.apple.driver.IOPlatformPluginFamily          4.7.0a1
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    com.apple.driver.BroadcomUSBBluetoothHCIController          2.4.5f3
    com.apple.driver.AppleUSBBluetoothHCIController          2.4.5f3
    com.apple.iokit.IOBluetoothFamily          2.4.5f3
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    com.apple.iokit.IOUSBHIDDriver          4.2.0
    com.apple.driver.AppleUSBMergeNub          4.2.4
    com.apple.driver.AppleUSBComposite          3.9.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          2.6.8
    com.apple.iokit.IOBDStorageFamily          1.6
    com.apple.iokit.IODVDStorageFamily          1.6
    com.apple.iokit.IOCDStorageFamily          1.6.1
    com.apple.driver.XsanFilter          402.1
    com.apple.iokit.IOAHCISerialATAPI          1.2.6
    com.apple.iokit.IOSCSIArchitectureModelFamily          2.6.8
    com.apple.iokit.IO80211Family          320.1
    com.apple.iokit.IOUSBUserClient          4.2.4
    com.apple.iokit.IOFireWireFamily          4.2.6
    com.apple.iokit.IOAHCIFamily          2.0.6
    com.apple.iokit.IONetworkingFamily          1.10
    com.apple.iokit.IOUSBFamily          4.2.4
    com.apple.driver.AppleEFIRuntime          1.4.0
    com.apple.iokit.IOHIDFamily          1.6.6
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          6
    com.apple.driver.DiskImages          289.1
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    com.apple.driver.AppleACPIPlatform          1.3.6
    com.apple.iokit.IOPCIFamily          2.6.5
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    Mac Mini (status: working) & Macbook (status: pending repair for random shutdowns)   Mac OS X (10.4.6)  

  • Mac Pro turns off for no reason

    For the past week or so my Mac Pro is on occasion just turning off, as if the power cord had been suddenly pulled. But only the Mac itself is cutting off, the monitor and other peripherals in the room remain running. There's no dimming in the power as far as I can and after today I don't believe that it is a power surge or loss that is causing the problem. Today the computer has started almost continually turning itself off after shorter and shorter time periods. Just winks out. I've checked all the plugs, ran DIsk Utilities and have the most current OS version installed.
    I'm stumped and find that with the machine only staying on for 5 minutes max now that my ability to tech the machine is severely hampered. Any ideas where to begin to look?

    I wasn't talking about one line per computer, just one line to your office and equipment off the circuit breaker that isn't shared by 1000W of other equipment.
    http://en.wikipedia.org/wiki/KillAWatt $15
    http://www.amazon.com/P3-International-P4400-Electricity-Monitor/dp/B00009MDBU
    Mac Pro's wake from sleep inrush current (check wiki).
    http://en.wikipedia.org/wiki/Inrush_current
    The Mac Pro wasn't behaving but nothing we can do. And rather than occur on cold boot, it was at its worse on wake from sleep, which a firmware update helped resolve, and models built after April didn't suffer from.
    A UPS protects your equipment and extends the life probably of components, like modem and the rest, and keeps it running better with fewer problems. I would never run a workstation and $5000+ of equipment (and data has value) without. While no single power conditioner can correct all power quality problems, many can correct a variety of them.
    http://en.wikipedia.org/wiki/Uninterruptiblepowersupply
    http://en.wikipedia.org/wiki/SurgeProtectiveDevice
    http://en.wikipedia.org/wiki/Line_conditioner
    The Quad G5 was like... walking into a hornet's nest to listen to, and see the 100s of posts in a single thread on "what UPS does this thing need" freakin' out so many.
    Surge strips have their place, just not going to do a lot to clean or condition voltage or some problems, and sometimes just a way to overload an outlet. I've found the best surge protectors in hardware supply store.
    A 1300VA $150 and 1500VA $175, plus best in line conditioner from ZeroSurge.
    http://www.amazon.com/1300VA-Battery-Backup-with-LCD/dp/B000XFXEDW
    http://www.amazon.com/APC-BR1500LCD-1500VA-Outlets-BACK-UPS/dp/B000NDA5E0/
    http://www.zerosurge.com/HTML/standaloneres.html

  • Mac mini turns off without any reason

    My Mac mini turns off without any reason. I just want to make a backup with time machine and after a while the computer doesn´t work anymore. I just see the start-screen with all the users and I had to sign with my user password. After the mac restarts, I had to start time machine again. I stopped energy-management, because I thought that might be the problem but not. Time machine should work the whole night, but I don´t want to sit the whole time next to the mac to wake him up every several minutes. What can I do?

    From the menu bar, select
     ▹ System Preferences... ▹ Security & Privacy
    If there's a closed padlock icon in the lower left corner of the preference pane, click it and enter your login password when prompted.
    Click the Advanced button and, in the sheet that opens, uncheck the box marked
    Log out after … minutes of inactivity

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