I posted in here a while back about my girlfriend's 17" 1.67Ghz Powerbook, which has an unfortunate propensity to freeze randomly. Someone suggested it might be the issue that seems to plague this model, which can be resolved by disabling processor nap. Unfortunately, this hasn't worked - it continues to freeze sporadically. It's not a kernel panic - it's a hard freeze, where no input from keyboard or trackpad is recognized, and the only thing to do is shut down by holding down the power key. The only thing I've noticed is that the Powerbook freezes only when not plugged in (ie. when it's running off battery). It generally happens when the battery starts to run down - usually at 60% or less. This at least means that the issue can be avoided by keeping the charger plugged in, but given that the whole idea of a laptop is that it's portable, this is less than ideal. Does anyone have any other ideas as to how to fix this? Any ideas much appreciated.