I have an acer aspire 4736,3gb ddr3,intel core 2 duo laptop which i have been using for the past two years. Recently i observed that while switching on my laptop, it won't complete booting process at first attempt. It displays the booting screen but before the login screen appears(sometimes even after 1 minute of appearance of login screen) the machine shuts down itself suddenly without any warning. After two or three attempts, it boots perfectly. There is no problem until the next boot.I am using the present battery from last year onwards(this is a new one i got from authorized acer service center i year ago).Still i am getting a battery backup of nearly 2.5 hrs since i handle it care.I never had this problem in the last two years.Please help me in this regard.