MacBook Buzzing/Whine coming from top left

I have a C2D, 2.2GHz, late 2007 model 13" white MacBook (not pro). I am experiencing a whine/buzz from the top left of my keyboard that starts as soon as the grey screen appears during boot. I have tried everything related to the CPU whine people talk about (just google Macbook or macbook pro and whine or buz) but to no avail (except using CHUD to disable one of the cores, so by everything I mean SMC and PRAM reset, QuietMBP and ShhMBP) none of which has helped in the slightest. The buzz is quite prominent, I can hear it currently as it sits on my desk next to me and I type on my desktop (even though I can hear the desktop fans going too, so the room is not utterly quiet). I don't know what else to do, I'm considering re-formating and re-installing the OS to see if some update/software caused the issue (I doubt it, but am at a loss of what else to try). Anybody have any other suggestions?
The reason I have not disabled the 2nd core using CHUD is I don't really want to reduce performance by limiting myself to one core (also, if it matters, I had apple install 2GB of ram rather than the normal 1GB when I ordered).
Any help at all would be nice, the noise is literally starting to drive me bananas!
Also, I checked for run-away processes in Activity Monitor, and even thought it might be fan related rather than processor at one point, and installed and tried fan control software, which made zero difference. The noise does seem worse when the computer is running a more CPU intensive task.

You're right, I doubt that it's a speaker issue but I just wanted to check anyway.
What you are describing sounds just like the problem I have, except that my noise goes away when I use quietMBP. I usually have to use a setting of 90 or so in quietMBP. In fact I can change the pitch of the noise by changing the quietMBP settings.
When power is connected,I believe the power brick works in harmony with the macbook to produce the lovely sound you're hearing. I had Apple replace my power brick, but that didn't solve anything. Once the brick is disconnected from the macbook, the power brick will stop making the noise, but the CPU whine will continue. I heard that logic board replacement sometimes fixes the problem, but I didn't want Apple to rip my computer apart, so I just decided to live with the noise. After a while (~3 months) you get used to it.
So the only solution, as far as I know, is to replace the logic board. Keep replacing it until it stops. It's not present in 100% of macbooks, so if you keep replacing that board, you'll finally end up with a good one.
I trust you read this already:
http://www.red-sweater.com/blog/159/the-quiet-mac
By the way, if the buzzing is louder when you increase CPU usage, more than likely you have a busted resister or capacitor on your board. The solution to that, of course, would be to replace the logic board--since the power transformer assembly sits on the logic board.

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MacBook Buzzing/Whine coming from top left

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