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Crashes when unplugged or plugged-in.

I have a 17" 1.33 PowerBook. I have no problems charging or booting, or running, but whenever I unplug the charger the computer will turn off. Or, if I boot when unplugged, and then plug in the charger, the computer will also turn off. It always happens just as the charger is about to disconnect (about 1/4 of the way inserted). With the computer off and the top-case removed, if I insert the charger plug 1/4 way into the DC-in board the PRAM battery makes a soft, high-pitched noise. I've replace both the DC-in and the PRAM battery, but nothing has changed this problem.

I'm at a loss. Could it be the charger? or the DC in board, the PRAM? or a short somewhere else? I don't want to buy a lot of new parts if it's most likely a short in the motherboard.

Any help would be appreciated, thanks.

Answered! View the answer I have this problem too

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Run the PMU reset and the PRAM reset and see if that helps. Ralph

http://support.apple.com/kb/HT1431

http://support.apple.com/kb/HT1379

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Have reset both in the past with no effect, and did it again, still with no effect. Have tried 2 different batteries, with the same result.

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If you can borrow another charger try that to a least eliminate a cause. Ralph

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Try connecting/disconnecting the power at the outlet. What happens when you do that?

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When I unplug from the outlet everything is fine. But even when unplugged, if i unplug from the computer, total immediate shutdown.

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Wiggle the power connector at the laptop end a little bit while its running. This may help you narrow down which is faulty, the power connector on your laptop or the end of the power cable.

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alexbrooks will be eternally grateful.
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