Hey people with this unfortunate problem,
I just got off the phone with Applecare. They're aware of the problem, likely thanks to the efforts of previous posters. They have internal support documents discussing the issue.
The Applecare rep said they thought it was the logic board. He didn't sound 100% sure of it, but definately seems like that's what they think. He said they dont think it causes issues in performance.
They offered me essentially every option. I can get the computer replaced, my logic board switched out, or take it in for inspection. I bought my computer 2 days ago, so I think this was a factor in their willingness to give me a new computer.
The Applecare rep. told me to do a hardware reset (remove power adapter, take out battery, and hold power button for 5 secs) and then boot up the hardware test. He said the problem would probably not be solved, and the test would come back clean, but I should do it just to see.
He also said that this was how you could reproduce the sound: Get in a quiet room, close all programs, open one finder window, wait 1 minute, then drag the window all around the screen. I haven't tried it yet.
The rep also said that Apple posted something about this problem
http://docs.info.apple.com/article.html?artnum=303365
It doesn't look like the same problem to me.
Well, that's about it. I'm gonna run the hardware test, and if it doesn't do any good, get a new unit (which will probably pop too 🙂.
I'll let you know what happens.
Cheers,
Josh