One more time - problems with fans

I realize this is but one of hundreds or possibly thousands of cases of Mac users being plagued by fan noise problems, but to me it has been a long and extremely frustrating saga. I have been a Mac user since the very beginning, through different versions of Macs and iMacs, and this is the first time I ever refer to a Macintosh as a "piece of junk."
I bought my iMac G5 in August 2005, a 20-inch ALS with 250 GB hard drive and 512 MB RAM. It worked perfectly until January this year, when all of sudden it shut down by itself. Freaked me out completely. Turned out to be power supply problem (EMC 2056) which Apple never informed me about.
I brought it to a repair shop that fixed the intermittent shut-down problem. I also added 1GB memory. But then the fans started to go berserk. Before the power supply problem, I only heard the fans whenever I used a large program like Photoshop. For the most part, it was a very quiet machine. After the power supply was replaced, within minutes of turning the iMac on, I could hear the fans spinning faster and faster, stabilizing at around 4400 rpm and did not stop spinning until I put the iMac to sleep or turned it off, regardless of CPU usage or software being used.
I checked the discussions at this forum (over 500 posts, no real answer) and did every "voodoo trick" suggested: I reset the SMU dozens of time, cleaned the inside of the iMac and around the fan area, did apple hardware test (everything was fine), monitored temperature and activity with XRG (average CPU at 160F, hard drive at 113F), cleaned out caches, tested for corrupt preferences, re-installed the original OS 10.4 (which only made the fans louder), upgraded it back to OS 10.4.9. I also removed the additional 1 GB memory, thinking it might be a bad piece. It didn't help.
Finally, I requested fan replacement from Apple and got them. I installed them last Sunday and now the problem is even worse! Within SECONDS of turning it on, the CPU T- Dio soars to around 170F, even while the machine is still stone cold to the touch. The hard drive temperature now averages at 117F, CPU fan is never below 4000 rpm (4400 rpm 98% of the time), even at 5-8% CPU usage.
The fans themselves are much quieter because they're brand new. But you can still hear the hums and whirs and it drives me nuts. More seriously, my iMac is now narcoleptic. If I use it too long (a few hours on a stretch) it will put itself to sleep, apparently because it thinks it is overheated. And when I use Photoshop or Illustrator, the awake time is even shorter. Depending on the outside temperature, at the most I can only use them for about an hour at a time. Two days ago we had heat wave, and even with the air conditioner running full blast in my study, the iMac kept falling asleep within minutes of using Illustrator.
Right now I am using TextEdit and no other program is running. Uptime is 59 minutes, average CPU 9.6%. CPU T-Dio is at 168.8F, hard drive 117.5F, CPU fan at 4400 rpm. I am out of ideas and before I do something drastic to this machine, if anyone knows what's going on with my iMac (I know every case is different), please help!
iMacG5 ECM 2056 Mac OS X (10.4.9) 20"/2.0GHz Power PC/1.5GB DDR SDRAM/250GB
iMacG5 ECM 2056 Mac OS X (10.4.9) 20"/2.0GHz Power PC/1.5GB DDR SDRAM/250GB

I do not have the solution... but the same problem with a nice iMac G5 purchased in July 2005.
My Mac operated very silently untill 6 month ago;problem MAY ( I am not sure) have started when I upgraded to 10.4.10 ; even with few applications and low CPU usage (80% or more inactive), it seems that I have the following regrettable chain of events;
==> the CPU temperature is quite high ( 60°c to 72°c most of the time, ie 140-160 °F)
==> resulting in fan turning at high speed ( 2.000 for CPU and system, 2500 for HD), and changing speed all the time
==> resulting in a noisy computer
I am SURE this was not the case 6 month ago, and I suspect it is linked to my upgrade to 10.4.10.
I did all sorts of reinstall, authorization repair, SMU reset, fan clean-up with no sucess.
iMac G5 (2005) Mac OS X (10.4.10) POwerbook G4 Titanium (2001)

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