Mac Book Air, Mother Board Failure

Hi, I purchased Mac Book Pro a year and Month Back, Yesterday battery came down to 5 % so i kept charging, as i am studying late nyt i closed my MBA. Next day morning when i tried to on it shown a folder with question mark symbol blinking. then i tried to on it in safe mode by it dint'showed harddisk. Then i taken to Authorised Service center then they said its Motherboard failure and asked me to pay 42000INR. Is this really problem of motherboard ? What are other best options for me ? and is this the price charged for Motherboard same as they are saying? can i have any legal right againt apple for replacement ??