I've been pondering the problem, and I have an uneducated guess. It sounds like a fan noise to me. That being said, after having a look at the iFixit teardown, (here: http://www.ifixit.com/Teardown/MacBook-Pro-13-Inch-Unibody/814/1 ) it feels like it is coming from the hard drive. I was checking around and I noticed an anomaly in my iStat temperature readings. Heatsink A shows 32 degrees F and doesn't change. This leads me (as does my wallet) to believe it is a bad temperature sensor on the heatsink sending the fans into overdrive. However, due to the location of the noise, that doesn't seem likely. Any guesses would be appreciated, no matter how remote. It doesn't look like I'll get into the Apple Store until the weekend, so any guidance as to if it is safe to use would be great. I am backed up.
Let me preface this by saying I am probably taking this to the Apple Store about an hour away from where I live tomorrow. For A while my MacBook Pro 13" has been making a loud spinning/grinding noise on occasion. Normally, I'd just shut down, boot up, and it would be fixed. Well, yesterday, that didn't work. After being told by the support guy that my free phone support expired 14 days ago (Mac bought in June), he said he'd do what he could to help. I told him about the noise and held the phone up to it (it is coming from the right of the trackpad). He said he had never heard that before and said to take it in to the Apple Store. I've found an Apple Support article, but it doesn't shed a lot of light on the situation. ( http://support.apple.com/kb/TS1823 )
So what I'm asking about is:
1. What is making the noise? To me, it sounds like an overactive/misaligned fan. The MacBook Pro also vibrates, and the sound changes volume and tone when I tilt the laptop iv various directions.
2. Is it safe to use my Mac with the noise?