Before today, I only had a MBP for about 2 weeks last month before I returned it in anticipation of the refresh. I do not recall it making this noise. What is happening when I turn on the new one is that it makes 2 higher pitched buzzing noises immediately followed by two lower pitched grinding noises. I've shut it down and started it back up a few times to see if anything has changed, but it's the same every time. Is this normal? If not, I'll take it back to Apple tomorrow. Thanks.