Re: iMac 20 with Intel processor: When I first installed a Maxtor external hard drive, Time Machine worked great, without intervention, for several months. It stills works great except, now when I log off (but not always), the connection to the external drive is lost (no icon on screen), and I have to throw the switch on the drive or Restart in order for it to be recognized (disconnecting and reconnecting the firewire also works). This is not a show stopper, but an annoying issue I would like to fix. All suggestions would be appreciated. Thanks!