Ever since I got my LaCie 160 GB drive, my PowerBook will not stay asleep. If the screen is closed, it will go to sleep for about a minute, than wake up for a few seconds, sleep for a minute, wake up etc. If I put it to sleep by pressing the power button and clicking sleep, it will go to sleep for about a minute and than wake up. If I let it sit for the time it says in the energy saver panel, it will just turn off the screen and not go to sleep. I have tried reformatting the HD but that didn't help. If I unplug the drive it will go to sleep. The firmware on the HD is up to date. Is there anything that I can do to fix this problem.