el capitan os x

Hi, my problem is about the first set up. When I boot for the instalation ( without boot flags ) all goes perfectly, then ends and the computer resets for the first set up and when is loading loads until middle of progres bar all disapears and holds in a black window. What could it be?:banghead:

Hello I own Notebook: LENOVO G50-80 80E501DLIX Technical specifications: Processore: CPU Intel Core i5 Nome Processore 5200U Velocità del processore in GHz 2,2 Velocità clock Turbo (Ghz) 2,7 Marca Chipset Intel Versione/data BIOS LENOVO B0CN95WW, 08/03/2015 Memoria RAM DDR3 Capacità...