I bought a 17 Macbook pro four months ago. It was fine the first days. But it has become very very slow and hard drive makes a lot of noise. It takes like 10 seconds for spotlight to find stuffs. I used Disk Utility and a 3d party app to make sure there's nothing wrong with the hard drive. Is there a way to fix hard drive slowness without having to format the Snow Leopard? If I use Time Machine to back up Snow Leopard on an external hard drive, then format Macbook pro's hard drive, and then bring back files to it using external the hard drive, is it going to have any effect?