Sometimes ago, i had a problem wih my notebook.. when i tried to switch on the notebook by pressing power button (without power suply, because it had enough battery power)..un fortunately nothing happenned.. no lights no led nothing..
I was scared..later on i connected power cord and then tried.. worked fine this time.. normal start up.. and turned off power supply but no issues. working fine now without power supply..
But i want to know why did i face that start up issue when i tried without power supply.. ??