Yeah, right, an easy one but nothing seem to work. I have my Powerbook under Jaguar and the hard drive never stop spining. In the Energy Saver control panel the option "Put the hard drive to sleep when possible" is checked but I can have that computer running all night long and the hard drive will be spinning too. I'm very concern because of the life of the hard drive. No matter if the Power Adapter in connected or not, looks like the unit just doesn't care or Jaguar doesn't work. Under OS9 the HD stops (of course, it is a superior OS). What can I do?