HI to all, i've a macbookpro 2012 a1278 (i5 4gb ddr3 1333ram, 500hd). i've used it without problem today listening some music (under recharge). then i've closed the macbook e i've gone out. coming back home, i've found it completely dead. the only thing the work is the light from mag safe. i've tried to disconnect the battery reset pvram smc etc etc....but it is all dead sorry for my bad english i'm writing from italy! P.S COULD YOU TELL ME THE EXACT MODEL OF MY MOTHERBOARD?