Macbook and connession problems

a part the fact I was banned...
I've reinizialed my macbook without installing mac os x 10.4.9 and the related airport extreme update...
it's a day my connections is ok... I think the bug is in the 10.4.9

Check the connector on the charger.  The pins are spring loaded and should move freely.  Also check for any dirt, debris or discoloration in the connectors.
Your MBP may have a faulty DC input board.  The best place to test for that is ay an Apple store genius bar.
Ciao.
There is an outside chance that a SMC reset may help:
http://support.apple.com/en-us/HT201295

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