I recommend you remove your hardrive and get a new notebook. Notebook motherboards are proprietary. You'll be lucky to find your model number; you'll pay too much for a used board with limited warranty. If a new one is available, by the time you pay for installation, you could buy a brand new notebook. Here's one example: http://www.bestbuy.com/site/Lenovo+-+Laptop+-+Black/459... (amd). An asus model with Intel core i3 cpu is about $50 more, but the link didn't work.
You might be lucky to find a slightly different model board that is still compatible with the rest of the machine but the odds are against you. Worse you are likely to not find a same model replacement at all but you can hunt around for a broken netbook of the same model and scrap it for a working board. Beyond that take the drive out and go buy a new netbook and sell the broken one off.