Powerbook randomly shutting off, but not completely

over the past few weeks, my pb has intermittently shut down, as in, the screen will go black, and the computer goes silent, but it appears like it has gone to sleep, b/c the white light on the front (where you press to open it up when the top is down), but it is impossible to wake up the computer. to make matters worse, i can't turn it off/restart it with the power button - it just doesn't work. in order to restart the computer i have to unplug it from the power source and take out the battery (and press the power button so it realizes that it is not actually on, becasue the white light continues to flash until i do this). and then i can put back in the battery and turn it on. when it restarts, the date/time is all messed up, saying it is jan 1, 1969. any ideas about what is wrong? fortunately it works fine after all this...but i'd love to know if there's something to be done (its still under warranty).
thanks in advance.

If it's still under warranty, send it in for repair.

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Powerbook randomly shutting off, but not completely

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