Hey all, I've done some Googling, and I'm not the first to report this issue, however I found the other threads on the subject to be inconclusive. I still don't know if this is a problem. I only hear it in a completely silent room, usually only when my ear is up near the keyboard's upper-lefthand corner, by the MagSafe connector. It's of course not the fan, and it makes the noise regardless of the MagSafe connector actually being plugged in, so it does this on battery, too. My best-guess based on the other thread is that it's the CPU idling? I dunno, it's not really a bother, I just don't know if it's a symptom of imminent failure down the line, be a shame if I lost my baby (yes, I'm sure I'll subscribe to AppleCare eventually since I love this thing so much). Anyway, any ideas? Maybe some of you brave souls out there will put your ears to the metaphorical ground in a quiet room and see if you hear anything? Would be much appreciated!