I have a 2.0ghz CD MacBook Pro from Spring 2006 and after suffering through the high pitched whine, screen brightness buzz and everything, I thought I was out of the woods for good. I should note that I had sent it in two or three times during that period to get the problem resolved, although it never really was completely. Anyway, this afternoon, I noticed an odd fan noise coming from the right side of my MBP. It sounded like the fan was misaligned, almost like a diesel engine (not incredibly loud, but noticeable). So I called Apple Care to see what it might be since this has happened sporadically in the past and has been increasing in occurrence recently. The tech support person told me to unplug it and remove the batter and then hold down the power button for 7 sec. After doing so, I turned it on and then a very, very loud grinding noise was coming from that same fan. It became so loud and disturbing that I shut the laptop down before it caused any damage. The tech support person told me that I could send it in for repair, I then asked her about the possibility of a replacement since this same MBP had been sent in to Apple around 3 times before. She transferred me to a higher-up and he had me go through some more trouble shooting/diagnostic work which caused the problem to seemingly become worse until the noise wound down (sounding like the fan was dying). He told me that I could get a replacement and that the shipping labels would be emailed to me. I guess I'm lucky that I'm managing to get a brand new MBP out of my troubles, but the problem still makes me curious. After getting off the phone with Apple, I downloaded smcFanControl to see if my fans were both still running, which they were. I then adjusted the right fan to see if it would still make the noise and it did just as bad as before and once again had to shut the computer off just to get the noise to go away. Currently, I've only got the slight diesel engine rumble that I had before. So my question is, has anyone else experience this problem, and/or does anyone know what might be causing it? *Also, on a side note, does anyone know if I can transfer Microsoft Office to my new MBP? I used the key to activate this version and thus don't have any more keys left.