I have an iMac that i like to use as my central computer. It's running 10.4.2 (i have not upgraded yet because of .3's bugs). For some reason, my iPod worked fine to sync up the first time, but any time after that when it gets connected it doesn't do anything and i have to hold down menu and play (i have a 3G iPod) hard restart it. when i do this the iPod's hard drive then starts to spin but i see the LCD flicker for a very short period of time and hear the hard drive stop and start up suddenly again, and the process repeats. has this ever happened to somebody, and what might be the cause of this?