24" iMac Fans

in Current Mac Hardware edited January 2014
I wonder if anyone can help me.

I have recently taken delivery of an Apple Re furbished white Intel core2duo 24 inch iMac.

The fans seem to run at full speed all the time.

I have tried, resettting PRAM, SMC, and all the things suggested on most of the posts i can find on the net.

I have downloaded and installed SMC fan control, and whilst it does see the fans and displays their speed, it doen't seem to control them.

Short of returning it to Apple, does anyone have any further suggestions ?
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