Annoying hum coming from MBP 09

Hey guys,
My Macbook Pro has been driving me nuts for the past week. Up until about last weekend, my MBP has been dead silent. I don't know if this is the case with everyone's, but it was the main reason I chose to try out a Mac instead of investing in another PC at the moment. However, there's a noise coming from it that completely negates the value of a Mac to me, and quite frankly I'm superbly annoyed.
There's a low humming/buzzing sound that it's emitting, and me being both a musician and nocturnal, it bugs the **** out of me when I'm up late working. It's not very loud; you can drown it out with pretty much any kind of noise. I don't know if it's the fans or the hard drive.
From the moment I press the power button, the sound starts. It doesn't go away, but it doesn't really get worse when I run other apps. I checked activity monitor, and there's no application using up a grotesque amount of CPU (the highest is usually activity monitor itself). I also checked iStat, and the temperatures all seem to be quite normal. The weird thing is, the fans are both running at around 2000rpm when idle.
Sorry for a long winded post, but this issue is really driving me insane.
Any help would be appreciated.

Your MBP is still under warranty, mnfthyr, so the obvious answer is to send it back to where you bought it from and ask for another, or for it to be repaired.
It may be simply an out of balance or dirty fan. It may be a defective HD. Yes the fans always run at 2000 rpm when idle. That is their idle speed. Nothing weird there. Normally they are pretty well silent when doing so, however.
But which bit of the MBP does this sound come from? Simply providing a bit more locational information might make it easier to pin-point the cause, whether it be mechanical or electrical.
Cheers
Rod

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Annoying hum coming from MBP 09

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