HELP PLEASE~How to turn the buzz off my iSight iMacG5...

Hi all,
I seriously need some help here. I've got my iMac 20" couple weeks ago, and it was quiet at first. I didn't hear the buzz sound coming from the middle left until maybe about 3~5 days. Now my roommate just got a 17" iSight iMac, which is whisper quiet. I still can hear the fan or air goes in and out from her machine but it is totally acceptable unlike mine...
I thought it was due to the upgrade to 10.4.3, so I reinstalled the OS again but the sound's still there. I then took it to a mac store to examine it. This evening a techincian told me it normally functions in a quiet room and he thinks everything's right, so I took it back but the sound's still there...
Few iMac 20" users here also have the same buzz problems like mine. I really hope it becomes as quiet as the first time I got it, so please let me know if you have any ideas to solve this...The buzz really annoys me especially when I don't hear anything from my roomate's...
Any input will be much appreicated. Thank you.

Why don't try reseting the SMU here are the Directions on how to do it.
The SMU (System Management Unit) is a microcontroller chip on the logic board that controls all power functions for your computer. If your computer is experiencing any power issue, resetting the SMU may resolve it. The SMU controls several functions, including:
Telling the computer when to turn on, turn off, sleep, wake, idle, and so on.
Handling system resets from various commands.
Controlling the fans.
Note that resetting the SMU does not reset the PRAM. Resetting the SMU will not resolve issues in which your computer is unresponsive—in these situations, restarting your computer will generally suffice. If your computer isn't responding, perform these steps one at a time, in this order, until the issue has been resolved:
Force Quit (Option-Command-Escape).
Restart (Control-Command-Power).
Force Shut Down (press the power button for 10 seconds).
Resetting the SMU can resolve some computer issues such as not starting up, not displaying video, sleep issues, fan noise issues, and so on. If your computer still exhibits these types of issues even after you've restarted the computer, try resetting the SMU. To reset the SMU on an iMac G5 (Ambient Light Sensor) computer, simply do the following:
Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
Unplug all cables from the computer, including the power cord.
Wait 10 seconds.
Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
Let go of the power button.
Press the power button once more to start up your iMac.
Unlike earlier iMac G5 computer models, the iMac G5 (Ambient Light Sensor) and iMac G5 (iSight) computers do not have a button on the main logic board for resetting the SMU. This eliminates the need to remove the computer's back cover to reset the SMU.
Post back, Miguel

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