I have a relatively new macbook (bought in Nov 2007). It is fantastic in almost every way ... except for when it wants to restart every single time I try to do a Time Machine backup. It did the initial backup perfectly but it hasn't done one since (over a month). TM starts fine but in the middle of the backup, I get the screen saying "you need to restart your computer." It also does this every single time I put in a dvd and idvd starts. Any thoughts? I've been living with it so far but I'm beginning to think I shouldn't have to ... especially since I absolutely HAVE to have a backup of my HD (or I'll lose my entire dissertation) so TM not working is kind of a problem.