My MacBook shut down and won't start up anymore

My MacBook unexpectedly shut down after I plugged my iPhone in laptop to charge. It happened when it had around 80percent battery but my charger for laptop was still in charging my laptop. I have not spilled any water on the laptop as I keep if in save dry places at all times. I feel pretty let down as I've just came out of they year warranty as I purchased this Christmas 2012. I am hoping someone in here can helps out and show any expert advice from reliable sources