Earlier tonite, I came back upstairs to my computer(15" PB) I try to wake it up, no such luck, then I noticed something strange. The hard disk was obviously still running, (I could heard it). No sleep indicator light. No button would make it respond, tried closing and opening the lid. Unplug power cord. Nothing worked. I called my friend who his an Apple user as well, he said to just take out the battery and reboot, and all is well. Anyone ever have an experience like this?