Kernel Issue

[jreff22]

Long time lurker, finally joined the site!!

Anyways here is the problem. I have an older iMac and it has started having issues recently. The system would freeze up needing a manual reboot via the power button on the back of the machine. What I did notice was the fan would run VERY loud (and so would the computer) even though nothing was being done on the computer. It would take a few reboots to get past the "kernel error you must reboot the computer message." Or the desktop freezing in the middle of the boot process-further requiring another reboot....see a trend?

Here is the most recent report that came up after this issue today:

Unresolved kernel trap(cpu 0): 0x400 - Inst access DAR=0x00000000E70E5000 PC=0x0000000030065400
Latest crash info for cpu 0:
Exception state (sv=0x31755A00)
PC=0x30065400; MSR=0x10009030; DAR=0xE70E5000; DSISR=0x10000000; LR=0x006EB464; R1=0x176E38A0; XCP=0x00000010 (0x400 - Inst access)
Backtrace:
0x01FE8480 0x006FD814 0x006FD168 0x006EB758 0x006EBBB0 0x006EBCF4
0x006EBD90 0x002C7E78 0x002F4C8C 0x002F4C44 0x002D2244 0x002F4EA8 0x002F1B1C 0x002EC058
0x0008C69C 0x00029234 0x000233F8 0x000ABEAC 0x00000000
backtrace terminated - frame not mapped or invalid: 0xF00800F0

Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.SMU_Neo2_PlatformPlugin(1.8.6f1)@0x6f9000
dependency: com.apple.driver.IOPlatformPluginFamily(1.8.6f1)@0x6e8000
com.apple.driver.IOPlatformPluginFamily(1.8.6f1)@0x6e8000
Proceeding back via exception chain:
Exception state (sv=0x31755A00)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x31BA8C80)
PC=0x9000AF48; MSR=0x0000F030; DAR=0xE70E5000; DSISR=0x42000000; LR=0x9000AE9C; R1=0xF00800F0; XCP=0x00000030 (0xC00 - System call)

Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0004): 0x400 - Inst access
Latest stack backtrace for cpu 0:
Backtrace:
0x000954F8 0x00095A10 0x00026898 0x000A8204 0x000ABB80
Proceeding back via exception chain:
Exception state (sv=0x31755A00)
PC=0x30065400; MSR=0x10009030; DAR=0xE70E5000; DSISR=0x10000000; LR=0x006EB464; R1=0x176E38A0; XCP=0x00000010 (0x400 - Inst access)
Backtrace:
0x01FE8480 0x006FD814 0x006FD168 0x006EB758 0x006EBBB0 0x006EBCF4
0x006EBD90 0x002C7E78 0x002F4C8C 0x002F4C44 0x002D2244 0x002F4EA8 0x002F1B1C 0x002EC058
0x0008C69C 0x00029234 0x000233F8 0x000ABEAC 0x00000000
backtrace terminated - frame not mapped or invalid: 0xF00800F0

Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.SMU_Neo2_PlatformPlugin(1.8.6f1)@0x6f9000
dependency: com.apple.driver.IOPlatformPluginFamily(1.8.6f1)@0x6e8000
com.apple.driver.IOPlatformPluginFamily(1.8.6f1)@0x6e8000
Exception state (sv=0x31BA8C80)
PModel: PowerMac12,1, BootROM 5.2.6f1, 1 processors, PowerPC G5 (3.1), 2.1 GHz, 1 GB
Graphics: ATI Radeon X600 XT, ATY,RV380, PCI, 128 MB
Memory Module: DIMM0/BUILT-IN, 512 MB, built-in, built-in
Memory Module: DIMM1/J6700, 512 MB, DDR2 SDRAM, PC2-4200U-444
AirPort: AirPort Extreme, 405.1 (3.90.34.0.p18)
Bluetooth: Version 1.9.5f4, 2 service, 0 devices, 1 incoming serial ports
Network Service: Built-in Ethernet, Ethernet, en0
PCI Card: ATY,RV380, Display, PCI-E
Serial ATA Device: Maxtor 6L250M0, 233.76 GB
Parallel ATA Device: MATSHITADVD-R UJ-846
USB Device: Hub, Up to 480 Mb/sec, 500 mA
USB Device: Built-in iSight, Micron, Up to 480 Mb/sec, 500 mA
USB Device: IR Receiver, Apple Computer, Inc., Up to 12 Mb/sec, 500 mA
USB Device: Hub in Apple Pro Keyboard, Mitsumi Electric, Up to 12 Mb/sec, 500 mA
USB Device: Apple Optical USB Mouse, Mitsumi Electric, Up to 1.5 Mb/sec, 100 mA
USB Device: Apple Pro Keyboard, Mitsumi Electric, Up to 12 Mb/sec, 250 mA
USB Device: Bluetooth USB Host Controller, Apple, Inc., Up to 12 Mb/sec, 500 mA

Any advice or suggestions would be much appreciated!!