IMac G5 Keeps Shutting Down

I purchased a 17" G5 iMac 2.0 GHz in July 2005. It's always worked great but now it keeps shutting down. It's starts up with no problem but when I leave it running (especially it seems overnight) I come back in the morning and it's off. Sometimes I've noticed the fan gets very, very loud so I'm wondering if it's getting to hot...and if so, why is this happening. Presently it has Leopard loaded. Apple store "genius" said I probably need new logic board but why would this be? I've never had a significant problem with my Macs so I'm at confused to say the least. Any suggestions are greatly appreciated.
Thanks, Vince

The Apple store "genius" is probably correct. Many iMac G5s had multiple failures with logic boards and power supplies. Our iMac G5 had at least 2 logic boards and 4 power supplies. It was very unreliable... the only Mac I have ever owned with any problem.
BTW, this is the discussion area for the iMac G4.
You probably want to ask your question in the iMac G5 discussion area.

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    com.apple.driver.AppleBluetoothMultitouch          66.3
    com.apple.driver.AGPM          100.12.40
    com.apple.filesystems.autofs          3.0
    com.apple.driver.AppleMikeyHIDDriver          122
    com.apple.driver.AppleHDA          2.1.1f12
    com.apple.driver.AppleMikeyDriver          2.1.1f12
    com.apple.driver.AppleUpstreamUserClient          3.5.9
    com.apple.driver.AppleMCCSControl          1.0.24
    com.apple.driver.AudioAUUC          1.59
    com.apple.kext.ATIFramebuffer          7.0.4
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AudioIPCDriver          1.2.0
    com.apple.driver.AirPort.Atheros40          500.55.5
    com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.0b2
    com.apple.driver.AppleLPC          1.5.1
    com.apple.driver.AppleBacklight          170.1.9
    com.apple.ATIRadeonX2000          7.0.4
    com.apple.driver.AppleIRController          309
    com.apple.driver.AppleUSBCardReader          3.0.0
    com.apple.iokit.SCSITaskUserClient          3.0.0
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    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          32
    com.apple.driver.AppleFWOHCI          4.8.6
    com.apple.iokit.IOAHCIBlockStorage          2.0.0
    com.apple.driver.AppleUSBHub          4.4.0
    com.apple.iokit.AppleBCM5701Ethernet          3.0.6b9
    com.apple.driver.AppleEFINVRAM          1.5.0
    com.apple.driver.AppleAHCIPort          2.1.8
    com.apple.driver.AppleUSBEHCI          4.4.0
    com.apple.driver.AppleACPIButtons          1.4
    com.apple.driver.AppleRTC          1.4
    com.apple.driver.AppleHPET          1.6
    com.apple.driver.AppleSMBIOS          1.7
    com.apple.driver.AppleACPIEC          1.4
    com.apple.driver.AppleAPIC          1.5
    com.apple.driver.AppleIntelCPUPowerManagementClient          166.0.0
    com.apple.nke.applicationfirewall          3.0.30
    com.apple.security.quarantine          1
    com.apple.driver.AppleIntelCPUPowerManagement          166.0.0
    com.apple.driver.AppleBluetoothHIDKeyboard          152.3
    com.apple.driver.AppleMultitouchDriver          220.62
    com.apple.driver.IOBluetoothHIDDriver          2.5f17
    com.apple.kext.triggers          1.0
    com.apple.driver.DspFuncLib          2.1.1f12
    com.apple.driver.AppleSMBusController          1.0.10d0
    com.apple.iokit.IOSurface          80.0
    com.apple.iokit.IOFireWireIP          2.2.3
    com.apple.iokit.IOBluetoothSerialManager          2.5f17
    com.apple.iokit.IOSerialFamily          10.0.5
    com.apple.iokit.IOAudioFamily          1.8.3fc11
    com.apple.kext.OSvKernDSPLib          1.3
    com.apple.driver.AppleHDAController          2.1.1f12
    com.apple.iokit.IOHDAFamily          2.1.1f12
    com.apple.iokit.IO80211Family          400.40
    com.apple.driver.AppleSMC          3.1.1d2
    com.apple.driver.IOPlatformPluginFamily          4.7.0b2
    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.driver.AppleBacklightExpert          1.0.3
    com.apple.iokit.IONDRVSupport          2.3
    com.apple.kext.ATI4600Controller          7.0.4
    com.apple.kext.ATISupport          7.0.4
    com.apple.iokit.IOGraphicsFamily          2.3
    com.apple.driver.AppleUSBHIDKeyboard          152.3
    com.apple.driver.AppleHIDKeyboard          152.3
    com.apple.driver.BroadcomUSBBluetoothHCIController          2.5f17
    com.apple.driver.AppleUSBBluetoothHCIController          2.5f17
    com.apple.iokit.IOBluetoothFamily          2.5f17
    com.apple.iokit.IOUSBHIDDriver          4.4.0
    com.apple.iokit.IOUSBMassStorageClass          3.0.0
    com.apple.iokit.IOSCSIBlockCommandsDevice          3.0.0
    com.apple.iokit.IOFireWireSerialBusProtocolTransport          2.1.0
    com.apple.iokit.IOFireWireSBP2          4.2.0
    com.apple.driver.AppleUSBMergeNub          4.4.0
    com.apple.driver.AppleUSBComposite          3.9.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.0.0
    com.apple.iokit.IOBDStorageFamily          1.6
    com.apple.iokit.IODVDStorageFamily          1.6
    com.apple.iokit.IOCDStorageFamily          1.7
    com.apple.driver.XsanFilter          403
    com.apple.iokit.IOFireWireFamily          4.4.3
    com.apple.iokit.IOAHCISerialATAPI          2.0.0
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.0.0
    com.apple.iokit.IOUSBUserClient          4.4.0
    com.apple.iokit.IOEthernetAVBController          1.0.0d5
    com.apple.iokit.IONetworkingFamily          2.0
    com.apple.iokit.IOAHCIFamily          2.0.6
    com.apple.iokit.IOUSBFamily          4.4.0
    com.apple.driver.AppleEFIRuntime          1.5.0
    com.apple.iokit.IOHIDFamily          1.7.0
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          165
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.DiskImages          326
    com.apple.iokit.IOStorageFamily          1.7
    com.apple.driver.AppleKeyStore          28.18
    com.apple.driver.AppleACPIPlatform          1.4
    com.apple.iokit.IOPCIFamily          2.6.5
    com.apple.iokit.IOACPIFamily          1.4
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    Bluetooth: Version 2.5.0f17, 2 service, 19 devices, 1 incoming serial ports
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    USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfa100000 / 2
    USB Device: Keyboard Hub, apple_vendor_id, 0x1006, 0xfa140000 / 5
    USB Device: Apple Keyboard, apple_vendor_id, 0x0220, 0xfa142000 / 7
    USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa120000 / 4
    USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000 / 3
    USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0xfa111000 / 6
    USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfd100000 / 2
    USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 4
    USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0xfd110000 / 3
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    Panics Since Last Report:          1
    Anonymous UUID:                    CD508005-6FF1-4227-886B-5E9252653063
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    panic(cpu 2 caller 0xffffff80002c268d): Kernel trap at 0xffffff7f80f089e0, type 0=divide error, registers:
    CR0: 0x0000000080010033, CR2: 0x0000000101405000, CR3: 0x0000000071a0504d, CR4: 0x00000000000206e0
    RAX: 0x00000000000005e5, RBX: 0xffffff8080423db4, RCX: 0x0000000000000000, RDX: 0x0000000000000000
    RSP: 0xffffff807f662ff0, RBP: 0xffffff807f662ff0, RSI: 0xffffff7f80fa16b0, RDI: 0xffffff806afcf004
    R8:  0x0000000000000000, R9:  0x0000000000000000, R10: 0x00000000000000ff, R11: 0x0000000000000010
    R12: 0x0000000000000054, R13: 0x00000000000000ff, R14: 0x0000000000000015, R15: 0xffffff807f663090
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    0xffffff807f662cb0 : 0xffffff8000220702
    0xffffff807f662d30 : 0xffffff80002c268d
    0xffffff807f662ed0 : 0xffffff80002d7a3d
    0xffffff807f662ef0 : 0xffffff7f80f089e0
    0xffffff807f662ff0 : 0xffffff7f80f08e58
    0xffffff807f663110 : 0xffffff7f80ea841a
    0xffffff807f663170 : 0xffffff7f80f0b4ad
    0xffffff807f663280 : 0xffffff7f80f3362b
    0xffffff807f6632e0 : 0xffffff7f80eda170
    0xffffff807f663480 : 0xffffff7f80f34726
    0xffffff807f6634e0 : 0xffffff7f80f34985
    0xffffff807f663520 : 0xffffff7f80ec29ee
    0xffffff807f663530 : 0xffffff7f80ef3bb5
    0xffffff807f6635a0 : 0xffffff7f80ebf879
    0xffffff807f6635e0 : 0xffffff7f8095d255
    0xffffff807f663620 : 0xffffff8000639d0e
    0xffffff807f663670 : 0xffffff7f8095d1d6
    0xffffff807f663690 : 0xffffff7f8095d793
    0xffffff807f6636d0 : 0xffffff7f8095cd81
    0xffffff807f663700 : 0xffffff7f80e7e9e9
    0xffffff807f663750 : 0xffffff8000344b0b
    0xffffff807f663860 : 0xffffff80003c333d
    0xffffff807f663ad0 : 0xffffff80003caee9
    0xffffff807f663b70 : 0xffffff80003cb3de
    0xffffff807f663d60 : 0xffffff8000580404
    0xffffff807f663e50 : 0xffffff8000563733
    0xffffff807f663e80 : 0xffffff800056142f
    0xffffff807f663f10 : 0xffffff8000561582
    0xffffff807f663f60 : 0xffffff80005ca258
    0xffffff807f663fb0 : 0xffffff80002d7f59
          Kernel Extensions in backtrace:
             com.apple.iokit.IONetworkingFamily(2.0)[59A00F6B-3710-3E07-9921-70C45782FF8C]@0 xffffff7f8094e000->0xffffff7f80976fff
             com.apple.iokit.IO80211Family(400.40)[78A58272-2170-3068-9C63-88301C99C406]@0xf fffff7f80e68000->0xffffff7f80e9ffff
                dependency: com.apple.iokit.IONetworkingFamily(2.0)[59A00F6B-3710-3E07-9921-70C45782FF8C]@0 xffffff7f8094e000
             com.apple.driver.AirPort.Atheros40(500.55.5)[01000ACB-C064-3F42-820F-BDE2008267 25]@0xffffff7f80ea0000->0xffffff7f80fdffff
                dependency: com.apple.iokit.IOPCIFamily(2.6.5)[95ABB490-3AB5-3D5E-9C21-67089A9AE6A1]@0xffff ff7f80861000
                dependency: com.apple.iokit.IO80211Family(400.40)[78A58272-2170-3068-9C63-88301C99C406]@0xf fffff7f80e68000
                dependency: com.apple.iokit.IONetworkingFamily(2.0)[59A00F6B-3710-3E07-9921-70C45782FF8C]@0 xffffff7f8094e000
    BSD process name corresponding to current thread: Audiogalaxy Help
    Mac OS version:
    11B26
    Kernel version:
    Darwin Kernel Version 11.1.0: Tue Jul 26 16:07:11 PDT 2011; root:xnu-1699.22.81~1/RELEASE_X86_64
    Kernel UUID: D52AAB80-B2BC-3C6E-BBEA-78BD28064998
    System model name: iMac11,2 (Mac-F2238AC8)
    System uptime in nanoseconds: 416590509706344
    last loaded kext at 387321841939230: com.apple.filesystems.cddafs          2.5.0 (addr 0xffffff7f807ef000, size 24576)
    last unloaded kext at 388659936046732: com.apple.filesystems.cddafs          2.5.0 (addr 0xffffff7f807ef000, size 20480)
    loaded kexts:
    com.apple.driver.AppleBluetoothMultitouch          66.3
    com.apple.filesystems.smbfs          1.7.0
    com.apple.driver.AppleHWSensor          1.9.4d0
    com.apple.driver.AppleMikeyHIDDriver          122
    com.apple.driver.AppleUpstreamUserClient          3.5.9
    com.apple.driver.AppleMCCSControl          1.0.24
    com.apple.kext.ATIFramebuffer          7.0.4
    com.apple.ATIRadeonX2000          7.0.4
    com.apple.driver.AppleMikeyDriver          2.1.1f12
    com.apple.driver.AppleHDA          2.1.1f12
    com.apple.driver.AGPM          100.12.40
    com.apple.driver.AudioAUUC          1.59
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AudioIPCDriver          1.2.0
    com.apple.driver.AirPort.Atheros40          500.55.5
    com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.0b2
    com.apple.driver.AppleLPC          1.5.1
    com.apple.driver.AppleBacklight          170.1.9
    com.apple.filesystems.autofs          3.0
    com.apple.driver.AppleIRController          309
    com.apple.driver.AppleUSBCardReader          3.0.0
    com.apple.iokit.SCSITaskUserClient          3.0.0
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          32
    com.apple.driver.AppleFWOHCI          4.8.6
    com.apple.driver.AppleUSBHub          4.4.0
    com.apple.iokit.AppleBCM5701Ethernet          3.0.6b9
    com.apple.iokit.IOAHCIBlockStorage          2.0.0
    com.apple.driver.AppleEFINVRAM          1.5.0
    com.apple.driver.AppleAHCIPort          2.1.8
    com.apple.driver.AppleUSBEHCI          4.4.0
    com.apple.driver.AppleACPIButtons          1.4
    com.apple.driver.AppleRTC          1.4
    com.apple.driver.AppleHPET          1.6
    com.apple.driver.AppleSMBIOS          1.7
    com.apple.driver.AppleACPIEC          1.4
    com.apple.driver.AppleAPIC          1.5
    com.apple.driver.AppleIntelCPUPowerManagementClient          166.0.0
    com.apple.nke.applicationfirewall          3.0.30
    com.apple.security.quarantine          1
    com.apple.driver.AppleIntelCPUPowerManagement          166.0.0
    com.apple.driver.AppleMultitouchDriver          220.62
    com.apple.driver.AppleBluetoothHIDKeyboard          152.3
    com.apple.driver.IOBluetoothHIDDriver          2.5f17
    com.apple.iokit.IOBluetoothSerialManager          2.5f17
    com.apple.iokit.IOSerialFamily          10.0.5
    com.apple.driver.DspFuncLib          2.1.1f12
    com.apple.driver.AppleSMBusController          1.0.10d0
    com.apple.kext.ATI4600Controller          7.0.4
    com.apple.kext.ATISupport          7.0.4
    com.apple.iokit.IOSurface          80.0
    com.apple.iokit.IOAudioFamily          1.8.3fc11
    com.apple.kext.OSvKernDSPLib          1.3
    com.apple.iokit.IOFireWireIP          2.2.3
    com.apple.driver.AppleHDAController          2.1.1f12
    com.apple.iokit.IOHDAFamily          2.1.1f12
    com.apple.iokit.IO80211Family          400.40
    com.apple.driver.AppleSMC          3.1.1d2
    com.apple.driver.IOPlatformPluginFamily          4.7.0b2
    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.driver.AppleBacklightExpert          1.0.3
    com.apple.iokit.IONDRVSupport          2.3
    com.apple.iokit.IOGraphicsFamily          2.3
    com.apple.kext.triggers          1.0
    com.apple.driver.AppleUSBHIDKeyboard          152.3
    com.apple.driver.AppleHIDKeyboard          152.3
    com.apple.driver.BroadcomUSBBluetoothHCIController          2.5f17
    com.apple.driver.AppleUSBBluetoothHCIController          2.5f17
    com.apple.iokit.IOBluetoothFamily          2.5f17
    com.apple.iokit.IOUSBHIDDriver          4.4.0
    com.apple.iokit.IOUSBMassStorageClass          3.0.0
    com.apple.iokit.IOSCSIBlockCommandsDevice          3.0.0
    com.apple.iokit.IOFireWireSerialBusProtocolTransport          2.1.0
    com.apple.iokit.IOFireWireSBP2          4.2.0
    com.apple.driver.AppleUSBMergeNub          4.4.0
    com.apple.driver.AppleUSBComposite          3.9.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.0.0
    com.apple.iokit.IOBDStorageFamily          1.6
    com.apple.iokit.IODVDStorageFamily          1.6
    com.apple.iokit.IOCDStorageFamily          1.7
    com.apple.driver.XsanFilter          403
    com.apple.iokit.IOAHCISerialATAPI          2.0.0
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.0.0
    com.apple.iokit.IOFireWireFamily          4.4.3
    com.apple.iokit.IOUSBUserClient          4.4.0
    com.apple.iokit.IOEthernetAVBController          1.0.0d5
    com.apple.iokit.IONetworkingFamily          2.0
    com.apple.iokit.IOAHCIFamily          2.0.6
    com.apple.iokit.IOUSBFamily          4.4.0
    com.apple.driver.AppleEFIRuntime          1.5.0
    com.apple.iokit.IOHIDFamily          1.7.0
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          165
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.DiskImages          326
    com.apple.iokit.IOStorageFamily          1.7
    com.apple.driver.AppleKeyStore          28.18
    com.apple.driver.AppleACPIPlatform          1.4
    com.apple.iokit.IOPCIFamily          2.6.5
    com.apple.iokit.IOACPIFamily          1.4
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