Fans only run slow, not fast on PowerMac G5 Dual 2.3

I've noticed recently that some occasional kernal panics seem related to the fact that under a heavy load my processor fans are not revving up. This is on my olde PowerMac Dual 2.3 from some time ago. We have the same model at one of our workstations at work and the fans kick in and out as we render, so I know what a healthy PowerMac G5 Dual 2.3 should sound like.
I've checked inside the case... the two fans in front of the processors are running, just really slow. The same with the two rear fans. I can't get them to spin up faster when doing anything processor intensive. Seems like it's been like this for a while, though it was definitely not always like this as I recall a few mornings where I found it in jet engine mode.
The white tab on the clear plastic internal cover is seated correctly... I don't know where any other sensors might be.
I ran the Apple Hardware Test from my original gray install disc... upon booting into the test I was surprised to hear the fans revving up to full speed. On the first run the computer had no problems. After a reboot into the OS and then another reboot back into the test disc, the full speed fans just locked up the OS choice screen and I couldn't get past it.
I see plenty of posts here regarding loud, fast fans that won't spin down... but I don't find too many with this problem.
Can anyone shed any light on this?
Thanks,
Dave

I run BOINC on my Power G5 and it places a full load on the processors for as long as the application is up. I find the fans are not very loud if you have done a proper dust cleaning of the computer. This includes cleaning out the power supply that's located in the very bottom of the case. If you think you have a problem I suggest you look into Istat Pro from http://bjango.com/. This will allow you to look at the fan speed to determine if you have a problem or if things are running normal. Under full load, my fan data looks something like this.
Drive bay 1000 rpm
Backside 1100 rpm
CPU A intake Around 800 rpm
CPU B intake Same as CPU A
CPU A exhaust About 30 RPMs higer that CPU A intake
CPU B exhaust Same as CPU A exaust
Slots Intake 1560 RPM
The only fans that seem to change much based on load are the CPU fans and with no load they may drop to about 500 RPM. Under full load on a warm day and the system in need of having the dust clean out I have seen the fans go up to 950 RPM. The fans that made the most noise were the Power Supply fans when I missed blowing out the power supply for a while.
The G5 processor is able to run at temperatures up to the boiling point of water but it truth I have never seen mine get above 164 degrees fahrenheit.
If you have just done a good cleaning of the system, it's possible you have just returned the system to normal operation and extended it's life instead of having a problem.

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Now before you start taking advice to back up all your data, reformat your hard drive, and reinstall all the software; please take note of a few things:
first off, I'm disappointed/frustrated/melancholy that this is happening to me. I spend $5000+ for a "reliable" Apple computer. Then it doesn't want to turn on because its not safe. Sorry if I drown this post with bitter sarcasm but I am coming to the end of the line with my patience.
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I like that feature. Good thinking Apple. Protecting my investment from bad electrical grids. But I don't like the fact my computer has a mind of its own where it decides when it wants to boot or when it wants to sit there and run its fans all loud.
I shut down Tues morn to go to work. I come back in the evening, it doesn't want to boot up. Instead of getting angry trying a bunch of times to turn on/turn off the computer, I leave my house all together and go and have a few drinks. I come home ,don't even look at my computer, and go to bed.
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(Just a side note: Apple calls them geniuses, but its hard for me to think some disconnected college kid with a bad haircut and questionable social skills knows what's up with the power supply issues of a computer; maybe I'm wrong, but you can run your diagnostics and look at the chart of what to do and all that BUT Apple needs to listen to the people)
I am going to get a UPS (uninteruptable power supply) with a clean sine wave output to curb the issue at my end. It's not my fault I live in a area that receives uneven power output. I live in Los Angeles. Summer is starting up and I think its going to be hot, so blackouts, power dips and sags are inevitable. I just don't understand why Apple hasn't considered this problem and fixed it with something:
A recall to change the power supply, Is it something on the logic board?, are they going to reimburse me for lost income (Ha, yeah right)
I really want to know how many people are having this problem?
From what I've heard, it is a common problem.
So I think we need a common solution.
If its so common, it must be the computer. We are all going to live in different areas where the power may vary. Not all of us have the consistent power flow of 1 Infinite Loop in Cupertino, CA. So if it is such a common problem, Apple needs to fix it.
I can't spend more than five grand on a super duper computer and have it wuss out on some power issues.
Its a loss of income and productivity to me.
I can't have that anymore.
Sometimes my computer turns on, sometimes it doesn't.
I bought my PowerMac G5 in April 2006, its been about a month and a half and I'm having these problems.
Thank you for your time.
If anyone else has been having this problem, I feel for you.
It was been very difficult for me not to curse in this post, but I have tried to extend the same respect to all that use these discussion boards to create dialogue, find help, and create solutions.
LETS FIX IT!
Peace,
Swami G
Power Mac G5 Mac OS X (10.4.6) 4.5 Gb RAM
Power Mac G5 Mac OS X (10.4.6) Dual 2.3 GHz / 4.5 Gb RAM
Power Mac G5 Mac OS X (10.4.6) 4.5 Gb RAM

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