[Athlon64] Computer power cycling randomly upon shut down.

Ok, for some reason my machine has started cycling power for a second in a cycle when I power down sometimes.
If I select Turn Off computer from Windows XP, the computer shuts down.
Then, I see the power light blink....the diagnostic lights of the motherboard, all four blink, the fan clicks and spins for a second.
This happens repeatedly. I tried unplugging the computer, then plugging it back in. As soon as I plug it back in, the process starts. The fan spins up, power light blinks on then off...diagnostic lights (all 4) go on, the network plug goes on. Now, this just happens automatically. I do not have to press the power on switch.
It's started happening with some regularity. I usually leave my computer running for days, so perhaps that's why I haven't experienced this problem more often.
Any ideas on what could be happening?

From what you are saying it doesn't sound like it is running well now.
I would do a reset and see if it will post. Then run Memtest86 at the correct RAM timings top see what you get. Otherwise the only other thing I can assume is the PSU went or maybe one of the componants somewhere in the box which will require more extensive troubleshooting. You are going to have to start somewhere.
Oh if you have overcooked the machine set it back to defaults.

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Thanks for all your help so far. I have to get a little work done, but I'll give your advice a go later on this evening. And now the report...
Unresolved kernel trap(cpu 0): 0x400 - Inst access DAR=0x00000000E9C55000 PC=0x0000000000000000
Latest crash info for cpu 0:
Exception state (sv=0x690D8780)
PC=0x00000000; MSR=0x40009030; DAR=0xE9C55000; DSISR=0x40000000; LR=0x002C949C; R1=0x37263DC0; XCP=0x00000010 (0x400 - Inst access)
Backtrace:
0x002C9438 0x0003CA1C 0x000A9714
Proceeding back via exception chain:
Exception state (sv=0x690D8780)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x53B33A00)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
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=0x690D8780)
PC=0x00000000; MSR=0x40009030; DAR=0xE9C55000; DSISR=0x40000000; LR=0x002C949C; R1=0x37263DC0; XCP=0x00000010 (0x400 - Inst access)
Backtrace:
0x002C9438 0x0003CA1C 0x000A9714
Exception state (sv=0x53B33A00)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC
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[Athlon64] Computer power cycling randomly upon shut down.

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