My Powerbook is a couple of months old, and this issue developed near the end of last week. It is not connected to AC power, and I don't have any Bluetooth devices connected to it. It will just turn on by itself, even when closed. I noticed it on for a couple days in a row when I came into work, but I never actually saw/heard it turn on myself until yesterday. After searching around online, the only solution I found mentioned was zapping the PRAM, and that didn't solve the problem. Any ideas?