Powerbook waking up randomly

Question

Every once in a while my Powerbook will suddenly awaken from sleep (with the lid closed). After a few seconds it goes back to sleep again. Sometimes it will do this over and over every few minutes.
The computer has done this both when plugged in and not (and it's pretty annoying to have 1/2 the charge vanish overnight!).
Wake when modem detects ring and wake for ethernet administrator access are both unchecked (and in any case, it is not connected to Ethernet or a phone line), nor is the PB set to wake up at a specific time.
Any ideas?
Powerbook G4   Mac OS X (10.3.9)  
Powerbook G4    

Answer 1

My Powerbook does it all the time but just stays on.
Nearly all the time the display stays off too so the
only way to get it going is to hard reset it which
Mine does that too sometimes, but I think that's a separate problem. It seems to happen on occasion (rarely, thankfully) that when I try to sleep my computer, the display turns off but the computer isn't asleep. (It's mostly asleep though; it can't be accessed remotely, for example. Or maybe it's crashed.) As you say, the only solution is a hard reset. Anyway, maybe for some reason your computer is more prone to this behavior, so when it wakes up and then tries to sleep again, it crashes.