27" I Mac, constant loud fan noise after replacing hard drive. Help

Having constant problems with noise since replacing my HD, which failed miserably.  Best Buy installed a 1T Seagate, sounded like airplanes taking off, took it back and they installed a Western Digital Cavair Green 1T.  Noise starts out soft, gets increasingly loud.  Can hear it running in another room.  Hate this- any suggestions.  I've already done the reset thing twice, no help. 

Is it a late '09? Is the noise the fan? And was your first HD a Seagate as well, with the correct temp sensor cable? Here's an explanation. Surely Best Buy would know that but maybe not. A 1TB Seagate is listed as working in the article, but it has to be a HD with the temp sensor inside, not attached to the outside of the drive.
http://blog.macsales.com/2751-proprietary-cable-can-put-the-brakes-on-upgrading- late-09-imacs

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