G5 crashes and fans sound like jet taking off

Hi,
I am in need of some answers. I have had my computer now for at least 2 years. It's a powermac G5 os 10.3.9. Just in the last month I have had more crashes than I can count even when the computer is idle. Then the fans kick in. I have not installed any new programs, i've repaired permissions, i've done the fsck and to no avail!!!!!!!! Can someone please let me know if this is fixable or if I have to live with this problem for the rest of the G5's life.
It's really slowing me down work wise. Since I have to reboot so often!

Thanks for the reply and link, japamac. That thread didn't pop up in my search.
After following your link, I ran the Apple Hardware Test. The detailed test took right at an hour and a half (three times longer than it said) and returned no problems.
I restarted and both CPUs showed up in the Activity Monitor and things were fine for about 20 minutes, then the system simply froze, while I was running Safari and Firefox. But, no loud fans this time.
Upon a hard restart and then a soft restart, I'm back to one CPU.
Since only one CPU is showing up, I don't have a faulty one to deselect (I installed the "Processor" System Preference from the Developer>Extras>PreferancePane) or disable via Terminal.
So, I've got a couple of questions:
1. Where are the error logs that I should look at?
I've opened the Console, but can find no mentions of "panic" or "cpu," other than some 3 year old references under "Java."
2. More importantly, *how do I know +which CPU+ has failed*?
I see no references to "CPU 1" or "B" or "0" or "A." It's as if I've suddenly got a Single 2.3 G5.
3. Any possibility that this is a software issue?
I'm wondering if a recent update of Safari could somehow be a culprit. I had it open and also had Firefox open, both with 10-12 tabs. I know they can be memory and processor hogs.
Anyway, I will reseat the CPUs and grab a serial number while in the process and report back after a while.
Thank you for your help.

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