Hey everyone, I purchased my Macbook in August 2007 and have no problems until Christmas this year. It started buzzing and I wasn't sure what it was, until a week later I got a folder with a question mark at log-in, from what I understand my hard-drive died. I replaced the hard-drive myself within a few minutes, very easy and no problems, and it runs perfectly. It's been two weeks and it's already buzzing again. I take very good care of my Macbook but I do transport it from class and back everyday. It's buzzing about 30-50% of the time. You can make it stop by putting a bit of pressure on a key, or beside the trackpad. Placing both hands on the keyboard, I can feel the vibration originating around the 6 7 Y U keys the most. What should I do? I'm very concerned, and annoyed. Thank you everyone in advance. - Mike.