Strange noise from MacBook Pro 15"

Out of nowhere, my MacBook Pro 15" started making a strange sound. It lasted for about 30 seconds and came back a few times (I haven't noticed a clear interval.) If it makes any difference, it's a mid-2009 model, 2.53 Ghz Intel Core Duo, 250 GB Hitachi HDD. Any thoughts on what it could be? It sounds similar to an old-style modem. I shot a short video and posted it to YouTube; hopefully, the sound comes through relatively clearly. I shot this on a phone, so it may not. Please see here: http://www.youtube.com/watch?v=HidXN9n5d7c

I have the same issue with macbook pro mid 2009.
It sounds like the old modem connection sound but I have no modem on this machine. A couple of things, I was connected by ethernet and surfing with Safari and the laptop was extremely hot especially around the ethernet port. Also, the sound wasn't coming through the speakers (no difference when muted), it seemed to be coming from under the keyboard.
It started with a sound like a modem trying to connect and then went into a high pitched tone that wouldn't go away until I shut down the computer.
Now this morning the sound has disappeared ( the computer is cool) but it was very strange, anyone have any idea what it could have been?
DM

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