Ok. So this started happenign this morning at school. I fully charged my PB and the battery reading is 99%. I close the lid of the powerbook...go to class When i try opening it up again, 15 min later, I find the PB has auto shut down. WHen I startup, i get this error that says "Clock has been set to before March 31 2002 and some programs will act sporadically" - i have the clock autosynced with apple. What the heck is going on?