The ultimate G5 fan problem: CPU Intake Fan speed error

Another saga of fan overdrive blowing. I have a Power Mac G5 Dual 2.0Ghz, about 3 years old. About 1 year ago, had fan blowing after sleep problems (fans blow super hard, cannot wake from sleep). Eventually resolved this with Apple Care by near-total hardware replacement: fan replacement, fan sensor replacement, case replacement, finally logic board replacement. Problem fixed for 1 year.
Recently problem started again. Now, the fans blow full speed all the time, from the moment of boot (before OS loads). At first, resetting NVRAM from Open Firmware fixed the problem, but after a day or two it would start again. Now, nothing works - although if i manually put computer to sleep, the fans do turn off, and computer does wake up, which is nice.
I have tried the following well-known fixes, none of which has worked:
- Repaired Disk Permissions from boot CD
- Set Processor Performance to Highest
- Trashed Energy Saver prefs
- Removed all peripherals
- Removed RAM
- Took out hard drives
- Reset PRAM
- Reset NVRAM (from Open Firmware)
- Reset PMU (motherboard button)
- Replaced PRAM battery
- Checked inner (clear plexi) door sensor
- Cleaned out dust from inside case
- Check temperatures, all i think within normal range (<40 degrees (c), except GPU which is 65)
- Reinstalled OS X (archive)
Finally I obtained the legendary Apple Service Diagnostic disc.
- Ran Apple Service Diagnostic
- all hardware passed
- Ran ASD fan calibration
- "Error CPU0: CPU intake fan speed error. Check that inner door is secure and in place."
The inner door is indeed in place, and as far as I can tell the sensor is working since the indicator red LED on the logic board turns on and off when you remove the door. Is there another way to check that sensor?
What else can I try? I've spent about 40 hours on this so far... The only thing I have not done is take out and reseat the CPU's, but as far as i can tell the only reason to do that is to force older versions of ASD to allow temperature calibration - but ASD v2.5.8 fixes that.

I am having the same problem with a dual 2GHz G5. It runs fine, all temperatures look normal (in the 30-40 degree range), but all the fans are stuck on full.
There's a bit of history here: I used this machine for a while and intermittently it would completely freeze and the fans would increase to full speed (presumably to prevent damage to the components). This was never fixed because it happened only about once a month. Then, all of a sudden, it failed to start up completely. I figured it was a bad logic board. So now I have swapped the logic board, resulting in the computer seeming working fine apart from the full fan speed.
I read that the reason for this is that it needs a thermal recalibration. So I ran the Apple Service Diagnostic disk version 2.5.8 and it does indeed report that the CPUs require calibration. Unfortunately about 10 minutes after starting the calibration it reports "Error CPU0: CPU intake fan speed error. Check that inner door is secure and in place." The inner door is indeed secure and in place and indeed the red LED does come on if the inner door is removed, proving that the sensor is working properly.
e.f. - if you have any luck with the things that you are trying please post back here.

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    aurelieng wrote:
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    Last edited by ginard (2012-11-16 18:09:19)

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    Last edited by Malstrond (2009-08-19 19:34:22)

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    How are you liking it so far?
    Just got mine, I've had and gone through 7 Asus g750 models. Starting with jw, then jm, then js, then jz. Had cpu thermal throttling on all of them. So now I switched to msi, gave up high cpu and low gpu temps for low cpu and high gpu temps. But I knew this before coming to msi. I render and edit 4k video, the cpu thermal throttle spikes, result in a glitch during that part of the final movie, when this happens over and over through the whole rendering process, the whole final video is poop. Asus final result was to tell me that I should be happy to get turbo, but to run stock without turbo boost aka 2.4ghz. I told them no freakin way am I running 2.4ghz, that's not acceptable, goodbye.
    And now hello, msi.
    Overall, asus vs msi, still blow for blow just as nice. But I will say I have no regrets coming to the GT70, fan noise a little loud while gaming, im not used to that. But I don't game much.

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