Imac g5 Rev A - Boots, dies after login, finder, etc.

My usual morning ritual at the computer and noticed the computer was awaiting a log-in, sign of a reboot. I rebooted and played, worked for 45 minutes or so, everything ok. Later as the wife was using the machine later in the morning, it began rebooting with shorter and shorter frequency until it only stayed on for about 45 seconds after login.
I pulled the back off, checked the LED's, 1-3 lit. When a reboot occurs, all lights are on, then off except 1. Nanostat? widget shows relatively low temps on the CPU 68-72 and strange temps on the drive 50? (78 in the house). Reset the SMU, PRAM. No luck.
Anyway the serial number is noted for extended warranty which expires Sept 30, 2006, so I will road trip it a couple of hours to LA to an Apple store. Anyone have any tricks or similar problems ? Thanks for a response.

Welcome to discussions:
your experience is not unusual, it sounds as if your Power Supply Unit and/or logicboard are failing, taking it to the Apple store is exactly the right thing to do.
Good luck and please post back with the ultimate diagnosis,
Miriam

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    dependency: com.apple.iokit.IOGraphicsFamily(1.7.3)@0xc25000
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    Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386
    System model name: iMac8,1 (Mac-F227BEC8)
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    com.vmware.kext.vmioplug 2.0.5
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    com.apple.driver.AppleUSBAudio 2.6.4b17
    com.apple.driver.AppleLPC 1.3.1
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    com.apple.driver.AppleUSBMergeNub 3.4.6
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    com.apple.iokit.SCSITaskUserClient 2.1.1
    com.apple.driver.XsanFilter 2.7.91
    com.apple.iokit.IOATAPIProtocolTransport 1.5.3
    com.apple.driver.AppleUSBHub 3.4.9
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    com.apple.driver.AirPortBrcm43xx 366.91.21
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    com.apple.driver.AppleUSBUHCI 3.3.5
    com.apple.driver.AppleEFINVRAM 1.2.0
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    com.apple.driver.AppleHPET 1.4
    com.apple.driver.AppleACPIPCI 1.2.5
    com.apple.driver.AppleACPIButtons 1.2.5
    com.apple.driver.AppleSMBIOS 1.4
    com.apple.driver.AppleACPIEC 1.2.5
    com.apple.driver.AppleAPIC 1.4
    com.apple.security.seatbelt 107.12
    com.apple.nke.applicationfirewall 1.6.77
    com.apple.security.TMSafetyNet 3
    com.apple.driver.AppleIntelCPUPowerManagement 76.2.0
    com.apple.driver.DiskImages 199
    com.apple.BootCache 30.4
    com.apple.iokit.IOSerialFamily 9.4
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    com.apple.driver.IOPlatformPluginFamily 3.4.0a17
    com.apple.driver.AppleSMC 2.3.1d1
    com.apple.iokit.IOHDAFamily 1.7.1a2
    com.apple.iokit.IOAudioFamily 1.6.9fc5
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    com.apple.NVDAResman 5.4.8
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    com.apple.iokit.IOUSBHIDDriver 3.4.6
    com.apple.driver.AppleUSBComposite 3.2.0
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    com.apple.iokit.IOBDStorageFamily 1.5
    com.apple.iokit.IODVDStorageFamily 1.5
    com.apple.iokit.IOCDStorageFamily 1.5
    com.apple.iokit.IOSCSIArchitectureModelFamily 2.1.1
    com.apple.iokit.IO80211Family 216.1
    com.apple.iokit.IONetworkingFamily 1.6.1
    com.apple.iokit.IOFireWireFamily 3.4.9
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    com.apple.iokit.IOATAFamily 2.0.1
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    com.apple.driver.AppleACPIPlatform 1.2.5
    com.apple.iokit.IOACPIFamily 1.2.0
    com.apple.iokit.IOPCIFamily 2.6
    Message was edited by: qgi
    Message was edited by: qgi

    HI,
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