sorry to repost this from last week...although i did get a response that i appreciate, it did not necessarily answer my question. maybe my question about taking care of my ibook was too vague...but what i really want to know is does it matter how long i keep my ibook on as opposed to sleeping (closed but on), or shutdown? is there a secret to getting the longest life out of my mac in terms of how long i keep the machine on/off/sleeping. i use the computer everyday, at various times throughout the day and usually leave it on for a week or so, and then shut it down overnight about once a week. during the day, when i am not using it, i shut the lid but leave it on. any thoughts/comments/past experiences would be appreciated!