CPU Fan Making Tons of Noise

I just got my iMac 24" back from a repair for the LCD screen, and when I bring it home I hear the CPU fan beginning to make a ton of noise when I only have one application (Safari) open. Even after closing it and having nothing open, the fans going nuts. I have an application to tell me how fast the fans in the computer are going, and it's running at 3600 rpm, when normally it only peaks at 1700 when having around 10 applications open at once. So, I took it back to the Apple store and the next day they said they "fixed it." Apparently not, because I just went all the way back there, came all the way back home, and the fan goes right back to 3600 rpm when having nothing open.
Note: I've NEVER had the fan go above 1700 rpm before taking the computer in for an LCD panel replacement. It's Apple's fault for the fan being broken apparently, and they can't even fix it.
What do I do now? I just bought my computer in May, can I get a refund for it now? I'm not going back and forth to the Apple store every time they say they "fix" it when they really haven't done anything. I just want my money back, or a brand new computer, and I'll be happy.

Interest. I got my 24-inch spring 09 iMac back recently from a LCD & logic board replacement and my CPU is also "going insane". The CPU fan is now running at 3600 as soon as I open most any application and then it stays there. Didn't happen before the service. I'm concerned that the speed increase will reduce the fan life, but more than that the noise is killing me. I got this iMac to replace a noisy G5 iMac and until this recent turn I've loved it because it has been so silent. My CPU temps have remained steady around 35 - 40 degrees C so it's not due to higher than normal temps.
I haven't had time to call Apple about it yet. But hope to do so soon.

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