Recentley, today and yesterday, my final revision 15 inch powerbook will randomly shutoff. Just blank screen nothing when it has decent battery life left and even when plugged in. From there, hitting the power button does nothing. The only way I have found to bring it out of this is to close the powerbook the sleep light will come one but when i open it and try to resume to awake mode nothign happens. From there I can hold the power button to shut it down then hit it again and it starts right up. Im sort of confused by this. It is killing me when im trying to type out my notes in class. If anyone has had similar problems or any thoughts on this please let me know.