Bizarre "heartbeat sound" started in left speaker and now won't stop!

At first, I heard this "heartbeat sound" (a pulsing beat almost twice per second) only sporadically, but now it is incessant and begins even before I get the login prompt on my new Macbook Pro.
Help!
Has anyone else experienced this incredibly annoying sound? Adjusting the volume control has absolutely no effect on this noise.

After much late-night searching for information and fiddling with settings to try and resolve the issue, I finally gave up with no luck. I also tried reboots, turning the machine on and off, and running off battery vs. A/C. NOTHING could stop that sound, and the sound would start about 3 seconds after turning the machine on, and would stop only the instant it would turn off (or Sleep).
I had resolved to wake up early this morning and reinstall the system software, before resorting to taking the machine in for service/exchange.
Well, when I woke up and "un-slept" the computer, that dreaded heartbeat sound was gone!! My machine was quite warm when it started yesterday, and the longer I worked the hotter the machine got, so I'm thinking it was heat related.
If it starts again when the machine gets hot, I will definitely need a replacement.

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