I've had my black MacBook for a couple of weeks now and am very happy with it, but for a few issues: 1/ The screen is starting to creak quite loudly when I open and close it. Like plastic rubbing against plastic. 2/ The battery doesn't appear to have the charge capacity that many others do. I'd put this down to different users, different uses etc, but using coconutBattery http://www.coconut-flavour.com/coconutbattery/ it shows that the maximum capacity of my battery is 92% of the original (the thing is 2 weeks old!!). 3/ I'm having some sound difficulty with the computer, in that it is currently refusing to play any sound when I watch videos on yourtube.com (having be fine previously) - I've played around with the settings as much as possible, but can't see why the videos would be muted. Firstly, if you were in my position, would you have the computer changed? And secondly, do you think my local Apple Store (where I purchased the computer) will allow me to change the computer?