Buzzing/Whirring Sound & Broken Fans???

So my MBP was making a buzzing, almost grinding sound in the top right part of the keyboard (right under the enter key) for a few days. I had no idea what it was, but after looking at my istat nano widget, I think that my fans are broken (they read 0rpm).
I've got a 1st generation MBP, so it's obviously not under warranty. Has anyone gone to the Apple Store to get the fans fixed/replaced (I'm assuming they can fix it there)? How much did it cost?

I take it that you did have this buzzing/grinding sound and now you don't and both fans now read 0 RPM?
It would be a good idea to run the Apple Hardware Test before visiting the Apple Store. The Apple Hardware Test is on Install Disc #1 of the gray discs that originally came with your machine. You hold down "D" as you start up to boot to the Hardware Test.
Usually the problem goes beyond just the fans, and you need to see what else might be involved. For example, often a thermal sensor will fail, which will cause one fan not to run. Then the other fan will run like mad to compensate for the non-running one, and eventually it will make lots of noise and eventually fail. You want to look for sensor error codes (SNS) and fan error codes (MOT). You also want to know if there is any other collateral damage from the fans not working properly, and this might well show up in the form of an error code. Finally, you should check on the SMART status of your hard drive, just to be sure it is not contributing to the noise you are hearing.
No idea what all this might cost--the parts shouldn't cost much, but the labor might. The parts may have to be ordered if you have it fixed locally, or you might need to send it off. But if you have a list of error codes, it will make it easier for them to give you a quote on the repair.
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