I have had my 15 inch MBP for about a month now and ever since I got it there has been a very high pitched buzzing/whirring noise coming from inside of it. I know it's not the fans because those are MUCH louder when they eventually kick on. But recently my computer has begun making a very deep, loud, clicking noise whenever I run more than 3 programs or so. On top of all of this it is running extremely slow. Is my hard drive shot?