Replaced Internal HD and New HD Fan Spins Fast

Greetings All;
My Dad ordered a iMac with intentions of giving it to my sister for a Christmas present. It came with a stock 500 GB hard drive. The hard drive was quiet. Since then, I replaced the hard drive with a 1.5 TB capacity one. The original hard drive and the new one were manufactured by the same company (Seagate). My problem is that the new hard drive makes the HD fan speed up to about 5000 rpm. I rechecked the temp sensor cable and connectors and all is good. I applied both the SMC and PRAM resets but still the HD fan spins to 5000 rpm. Details of the iMac are below:
iMac version 11,2 Mac OS X version 10.6.5 21.5 inch
Seagate (old) hard drive 500 GB, model ST3500418AS, firmware AP25
Seagate (new) hard drive 1.5 TB, model ST31500341AS, firmware CC1H
Is there a solution to correct the speed of the hard drive fan? According to iStatPro, the new hard drive is the coolest component in the iMac usually running around 25 to 26 C.
In advance, thank you for your advice.

Hi SBA-Mac
Put the original HD back in or go to your Local Apple Service Provider and see if they can hook you up with a Hard Drive that has the correct built-in temperature sensor for that iMac.
http://www.apple.com/buy/locator/service/
Dennis

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