LED did not lit up and the battery is not charging

Question

I'm using Macbook model A1342 late 2009
For the past 4 months or so, it's been hard for the charger connect to properly connect and charge. However, it has always worked when I wiggle the connect a bit. Last week, no matter how hard I try, it won't charge. I tried to use my friend's charger but still, it wont charging. I can still turn on and off my laptop while the battery is about 40% left. I even install the Macbook application install DVD for apple hardware test and it said that my laptop is working properly. Untill the battery turns 0% and it shuts down on its own. I first thought it was the battery failure. Then, I sent it to a local apple service centre in Russia to make sure whether I can change a new battery. They run some diagnostic and said it wasnt the battery, it was the logic board! I never spill any liquid on it. And how is it possible that the logic board is broken but I can turn it on???? Can someboy please help me??

Answer 1

But what about yours with her computer? Just to be sure the cause is not a banal contact of the plug. If yours is also OK with hers, then concentrate on other possible causes, i.e. battery or worse, the contacts inside. It isn unlikely to have a software issue, i.e. a corrupt system, which does not correctly read/send data, but chck this too. The simplest way is to connect your mac via firewire to the other mac, and start it in target mode; and vice-versa. You should thus check if systems are OK.
For starting in target mode look up in apple.com, i.e. here:
http://support.apple.com/kb/HT1661?viewlocale=en_US&locale=en_US
http://docs.info.apple.com/article.html?path=Mac/10.6/en/8443.html
When clear that system is OK, concentrate on the other hardware issues. The logic board may indeed be the big trouble, as you cannot repair it, and replacing it may prove too expensive.