Core 2 Duo Popping on Left Side

I have a MBP Core 2 Duo (4,1) that keeps popping on the left side. It sounds like it's coming from around the F2. It's getting more frequent and louder over just a short time. This all started maybe a month ago after years without a problem.
An Apple Genius looked at it in the store, and he could find nothing except that maybe it was the speaker. But the store is always so loud that I don't think you could hear a computer doing anything less than screaming.
This popping happens even with the speakers on mute, and I really do not think it is the speakers. There's no cell phone near it when this happens, and it happens anywhere, so I don't think it's interference.
It's not the hard drive as I have replaced that in the meanwhile, nor is this a hard drive sound.
The popping is a steady beat when it's happening. And it doesn't happen all the time. I can't really replicate the sound. It just does it's own thing. I do, however, hear it most often either when I have recently disconnected the power or when the battery is charging. (The power socket, however, doesn't matter.)
The really odd thing is, I seem to be able to stop the noise by activating the Mirror widget and/or SystemLoad (http://www.bresink.com/osx/SystemLoad.html). SystemLoad doesn't have to run for more than a second to make the sound stop — instantly. I don't know what that means, but it must indicate something, right?
Since I just upgraded my OS from 10.5 to 10.6, Apple has given me an additional 90 days of warranty. So, if there's something I need to try, I would like to do that soon.
Thanks for any ideas.

I guess I can't modify my post.... But I wanted to add this:
I don't think it's a fan hitting something as I blew those out when changing the hard drive.
Often, the volume of this popping is constant, but it's sometimes more LOUD-soft-tiny bit softer-LOUD soft-tiny bit softer. If I had to put it in numbers, I would guess 10-6-5.

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