Random Automatic PowerUp on MacBook when connecting MagSafe

Hi everyone.
I've searched a lot before posting but nothing useful for me.
I've already tryed resetting smc, nvram, pram etc.
I've read about moving the MagSafe pins with the plastic cap of a pen, but it sounds me very strange.
I have a brand new battery and charging and everithing it's ok, but in the middle of the night (when charging) it's a little scary ear "BOING" came out from the mac
I remeber that it won't happen with 10.5.2 and I also remeber that it happened with 10.4.9
is it probably something going wrong during the updating?

Welcome to Apple Discussions!
Make sure no software named Boom or any part of Parallels might not be comaptible with the latest updates. Make sure your data is backed up at least twice before troubleshooting further. Let us know when it is, if you need more help.

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Apple Portables: Troubleshooting MagSafe adapters26 May 2011 ... If the spark comes from somewhere other than the blades of the plug, .... Apple Portables: Reducing cable strain on your MagSafe power ...
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Mag Safe power cord sparks when...: Apple Support Communities6 Jun 2011 ... Mag Safe power cord sparks when connected or disconnected ...
https://discussions.apple.com/message/15350172
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