Macbook Just switched off and now Noise!

HI,
I was working on my macbook with out mains power, with around 15% battery life left the whole things just switches off, i mean completely dies! I switch it back on and now there is this noise like its reading a cd or something and it doesn't stop! the battery icon is not responding to showing different icons as in time, % etc....when it died there was no Low Battery reminder shown it just went blank, but im sure there was around 15& left when it happened.
also now, when i try to charge it the light on the charger is not illuminating at all......
Any suggestions anyone????
Best,
brian.

HI,
i just answered this myself, googled it and found a article on mac website that told me a simple reinstall of the battery was all that was required and it worked!!
many thanks,
brian.

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