Fan revs up then iMac shuts down

My mid 2005 G5 ran fine for 13 months. Then, this fall the fan started speeding up almost immediately after power up. We cleaned the fan and ports, reset pram and it was better for a few days. Now the fan comes on and runs high speed in less than 10 minutes, even if the only processor use is email. Today, while only surfing in Safari, it shut down. Restarted and it shut down again.
Checked the Apple notice but this machine is not in the serial number range with the extended service for the power supply.
Any suggestions?

I am sorry to say that I have the exact same problem on my 2005 iMac G5 17". The fan noise started a few months ago (about 14 months after delivery) and is relentless and extremely annoying. It is louder than the speakers on the computer.
Last month, I did a search on several websites for solutions to the problem, but only found other people with the same problem told by apple that it was not an issue.
Unfortunately, I have not been able to correct it at all, and it only is becoming progressively louder and occurs every time the machine is not sleeping.
iMac G5 (PowerPC) 17"   Mac OS X (10.4.8)  

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