IMac 20" G5 (gen1) with out of control fans

My iMac's fans are running at speeds that are driving me and my office mate completely out of our minds. Currently, terminal reports:
"location" = "System Fan" | | | | "target-value" = 1240 | | | | "location" = "CPU fan"
| | | | "target-value" = 4343
| | | "location" = "Hard Drive"
| | | "target-value" = 1800
| | | "location" = "sysclk slew"
| | | "target-value" = 1
The CPU is running at an average load of 26.1% and is at 144.3 degrees, with no out of control processes, and the hard drive is at 125.6 degrees. That's with only 5 applications running.
I'm running OS 10.4.3 and the iMac has 2 gigs of RAM. I've run the Apple Hardware Test disk, which reported no problems, and have run an overnight memory test, which also reported no problems and have reverted back to the Apple supplied memory with no positive effect.
I've also (several times):
• reset the SMU (PMU for older Mac fans)
• cleared the PRAM
• run disk utility
• repaired the permissions
• done a clean software install
Nothing has worked. This is all on a computer whose firewire didn't work out of the box and which I repaired with a refurbed motherboard when it was less than a week old. Nothing like buying a new machine and getting a refurbished one to start you off on the right foot.
Now I'm trying to get this computer, which is under warranty, repaired but can't even find a number that I can call where I won't get charged! I live in Maine, so taking it to an Apple Store, or even a convenient service center is out of the question. Can someone advise?
This has been, without a doubt, my most disappointing Apple experience ever (and I owned a Mac Portable!)

Timothy,
I'm certainly open to another member's disagreement on this, but It appears to me that you have done everything necessary to disqualify software as the cause of your fan issue.
In that case, it's probably worth it to you to go ahead and give Apple your credit card to enable phone support for this issue, as it appears likely to be hardware related, which will cost you nothing (they should only charge you if it turns out to be a software issue.
Phone support will go down a list of things that you need to do to disqualify software, all of which, I believe, you've already tried. The only risk would be if phone support comes up with a software fix that no one on this board thinks to recommend to you. However, on the bright side, if no one on here can come up with another idea to try, and phone support has one that does work, it's going to be worth the cost, what is it - $75, I think?
I suppose your alternatives would be to:
1. buy some books or an AppleCare repair course and become an expert,
or
2. buy AppleCare and get free phone support back for both software and hardware for another two+ years, as well as valuable rights to in-home repairs.
If you have seen your iMac run well at times, and can see keeping it, AppleCare at $169 could be a bargain for what you might get out of it in phone support alone, not to mention another expensive part replacement a year from now. Furthermore, there are times it can be found at a lower price on eBay, usually a bit under $100 delivered. I have bought several, for this one I'm using, for a 17" that I sold, plus as a gift for a relative's iMac.
Best of luck.

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