i have purchased a lenovo z560 laptop before 1 year. its warranty period is over. And i got a trouble of rendomly shutdown of my laptop. this is the requirement of laptop: 2 gb DDR3 RAM 500 GB HDD intel core i3 M350 2.27 GHz please give me solution of this problem.I m tired of this problem.I can't work properly due to this problem. Any suggestion would be well.