Hello, I purchased my Macbook (111.86GB Fujitsu) in September 2007. Until the start of this year (2009) I have no complaints and been a very happy mac user, but since January it has started behaving very strangely. It "hangs" constantly even when I only have one application running. I can't even send an email or write a word doc without it hanging every few minutes (for 3 mins or so at a time), generally it will start running again for a while and then the beachball comes back and it simply won't stop. The whole thing freezes, force quit doesn't work and I have to force shut down. I have been to my local Apple service centre and they say the hard drive is fine. But the problem is still there. Then when I took it back they did an archive and install and I've got Leopard installed. Ran better for about half a day and then the same old problem is back and it's deteriorated since. When I try to start up again after having to use the force shut down, it often will not start up and I get a blank grey page, or the circle with a diagonal bar through it. I turn it off again and try again, and again, and again, and eventually I get the apple symbol and some action. I'm at a loss as to what to do. I'm not a mac / computer expert by any means, but I'm also not an idiot. I have no idea how I can explain the situation to the service centre staff that will make them actually DO something. Can anyone offer any advice or point me in the right direction?