Lousy 'fan' noise after installing a new internal hard drive

Hi,
I installed a new internet hard drive to replace my corrupted hard drive. The new hard drive is WD 320GB. Somehow, i got it installed and work. I install leopard on it and it works well as far as this point. Now, I have a new problem. Before installing the hard drive, my iMac run very quiet. Now, as soon as I turn on my iMac, i can hear a very noisy and loud 'fan' sound. I do not know if it is hard drive spinning or one of the fan. I do not notice any weird sound except it definitely a very loud spinning fan sound. I do not have Apple Care or warranty with Apple. Any suggestion to isolate the problem pls ?
I use iStat Pro and have the following info:
- CPU fan : 800-900 rpm
- CPU and GPU temp : 40 - 60 C degree
- Hard drive fan : 5000 rpm
Another question is : when i take my old hard drive, i noticed it has 1 power cable, 1 SATA cable and 1 small cable with connect some kind of chip on my motherboard to a small chip on the right hand side of hard drive. It appears to me that Apple attached a small chip on the side of hard drive. And i do not know where to connect that wire to my new hard drive. So i just left it un-connected. Thought, i connect power cable and the SATA cable. Any idea what that wire used for ?
Thanks
Message was edited by: DeathNote

Hi Dennis,
Thank for informing me the heat sensor. Basically, i can take the heat sensor out from my old internal hard drive and stick it on the new drive ? If so, how do i do it ? can i use any glue to stick heat sensor on new drive ?
Also, I just figure something. I opened the front cover, then run iMac. I noticed the noisy sound, i thought it might be the fan or the hard drive. So , i disconnect the fan power cable and restart the computer. Now, it runs very quitely. I can not hear anything noise as all. No thing. So i assume that the hard drive is not the problem. As soon as i plug back the power cable for the fan. The noise come back.
Is there a software to control the speed of the fan ? Using Istat, i have the following info :
- CPU : 42 C degree
- HD : 29 C degree
- GPU : 43 C degree
- Ambient : 22 C degree
- mem controller : 37 C degree
- CPU fan : 860 rpm
- HD fan : 5000 rpm
- Optical fan : 800 rpm
Thank you .
p/s: inside my iMac is different than in the picture.

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What I did on our two computers was partition the hard drive so that both Snow Leopard and Mountain Lion can be used on the computers. This allowed me to be able to retain/use older applications and games on the Snow Leopard partition. This will allow you to do a clean install of Mountain Lion on the newly created partition. The Mountain Lion installer has a button that allows you to select another drive so you don't install it over Snow Leopard. I cleverly name one partition Snow Leopard and the other one Mountain Lion so I wouldn't confuse the two (I never claimed to be smart).
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Lousy 'fan' noise after installing a new internal hard drive

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