Hi, for some reason yesterday, the computer started to freeze within 5mins of startup. it would boot up fine, but when you try and use any application (eg. safari) it would simpy crash. i have tried the following to rectify the problem, but it seems now to have gotten worst. 1. i reset the permissions through the disk utility - computer crashed half way through 2. i reset the permissions through TERMINAL - successful 3. i also ran FSCK (by typing "fsck -f") - now the computer does not even start up. it seems to freeze even before it gets to the blue/grey screen.. what could be the problem and how can i rectify this!