Why is my fan so loud on my 2006 iMac?

I just had my 2006 24" iMac 2.33 Ghz Intel Core 2 Duo repaired due to video card (nVidia GeForce 7600 GT) failure and a refurbished card was installed. Now, for some reason my fan is very loud. I did the SMC reset procedure four times and the fan is still loud. Any further suggestions would be appreciated. Thanks!

When I had my new hard drive installed and extra memory two months ago, the tech said that he removed dust from inside the Mac. When I just went to pick up the Mac after the video card replacement, the tech showed me it working and I did not detect the loud fan at that point. It was not until I got it home and  plugged it in and started it that I noticed it. I just ran activity monitor on the Mac and the top usage was only 1.7%. Could there be another problem than dust? I appreciate any further help! Thanks!

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    I bought my PowerMac G5 in April 2006, its been about a month and a half and I'm having these problems.
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    If anyone else has been having this problem, I feel for you.
    It was been very difficult for me not to curse in this post, but I have tried to extend the same respect to all that use these discussion boards to create dialogue, find help, and create solutions.
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    Peace,
    Swami G
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    Well, you can see my specs below. I have the same problems as you, just worse. I am also running (as I have my previous systems) on an APC Smart-UPS 2200, and it doesn't solve this problem.
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